Computer Science Canada

Euclid Contest Preparation
Author:  endless [ Thu Feb 26, 2009 8:48 pm ]
Post subject:  Euclid Contest Preparation
Hey guys, i know there are many of us here waiting to be admitted for UWaterloo and will be writing the Euclid Math Contest whether it be for admission help, or scholarship chances. Anyway, thought i would create a thread where we could discuss problems and such to help each other.

Here is the Information for the contest (dates and such): http://cemc.math.uwaterloo.ca/contests/euclid.html
Euclid eWorkshop: http://cemc.math.uwaterloo.ca/contests/euclid_eWorkshop.html
Past Contests: http://cemc.math.uwaterloo.ca/contests/past_contests.html#euclid

By the looks of it, it looks a lot easier than the Sun Life Financial Canadian Open (in my opinion) since it is more math skills, less grinding/ problem solving on the spot.

So let the games begin.

I'll probably be back in a bit with some sequences and series questions since these are what i seem to need the most practice on.
Author:  saltpro15 [ Thu Feb 26, 2009 9:00 pm ]
Post subject:  RE:Euclid Contest Preparation
the Canadian Open was brutal... I'm in gr10 and I wrote it this year, I scored 35/100 Sad
Author:  Dark [ Thu Feb 26, 2009 9:27 pm ]
Post subject:  RE:Euclid Contest Preparation
Yeah I hope I can get a 50% on the Euclid...lol.

Gonna have to start preparing after all my essays and such due by March Break Sad
Author:  jcollins1991 [ Thu Feb 26, 2009 11:16 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
saltpro15 @ Thu Feb 26, 2009 9:00 pm wrote:
the Canadian Open was brutal... I'm in gr10 and I wrote it this year, I scored 35/100 Sad


it was evil... i thought i did better than i did, so i guess i made some calculation errors somewhere...

Dark wrote:

Yeah I hope I can get a 50% on the Euclid...lol.

Gonna have to start preparing after all my essays and such due by March Break (


if you're in grade 12,(and are taking calc and vectors) you should be able to do most of the problems... looking over the past contests the only thing that i wouldn't be able to get is the data stuff, and i've borrowed someones notes to read (didn't take the course...)...
Author:  A.J [ Thu Feb 26, 2009 11:18 pm ]
Post subject:  Re: Euclid Contest Preparation
I wrote the euclid since grade 9...it is relatively easier than the open, I agree..

I got a 65 on the open this year and I am hoping to get >85 this year on the euclid...

the euclid is basically testing your knowledge on the school curriculum, thats why universities look at it a lot as opposed to other contests.

one main factor in doing well on the euclid (apart from actually solving the questions) is time management...making sure to split up the questions into chunks (for example, 1->4, 5-> 8 and 9 -> 10 is a good way of dividing the questions in to groups of increasing difficulty) and set a 'goal time' in which to finish each of them by.

doing the past contests really help, as they give you a feel of the contest's difficulty/formatting

a lot of people tend to write too much on the full solution questions (guilty as charged!) .....just show what is needed and don't elaborate...

as the contest approaches, Il'l try posting some good practice questions if people want any.


@saltpro15 do u mean 35/80 ? or 35% of 80?
Author:  endless [ Fri Feb 27, 2009 2:52 pm ]
Post subject:  RE:Euclid Contest Preparation
yea it seems like the data management stuff is the only stuff i haven't really seen before, so i will be focusing on the sequences and series eWorkshop to learn that stuff. also, it doesn't look like they test too much in calculus which is nice since we are just in calculus now.
Author:  saltpro15 [ Fri Feb 27, 2009 3:12 pm ]
Post subject:  RE:Euclid Contest Preparation
was the open out of 80? I though it was 100, well either way I got 35 marks Sad
Author:  Insectoid [ Fri Feb 27, 2009 4:43 pm ]
Post subject:  RE:Euclid Contest Preparation
Canadian open wasn't hard at all for me. The only questions I didn't get were the ones I hadn't been taught to do. For example, one of the questions was

there is a 4X4 grid. A token starts in the bottom right corner. It can move 1 place every 'turn' directions up or left, until it hits the top left corner or goes off the grid. What are the odds of it hitting the top left corner?

It was worded far better than what my terrible memory can recall, though a simple binary check will work. It takes 4 moves exactly to get to the end, 2 must be up, 2 must be left. so, if up = 1 and left = 0 it is easy to go through every possibility as long as you can count in binary.

0000
0001
0010
0011 -yes!
0100
0101 -yes!
0110 -yes!
0111
1000
1001 -yes!
1010 -yes!
1011
1100 -yes!
1101
1110
1111

6/16 = .375 = 37.5% chance.
Author:  saltpro15 [ Fri Feb 27, 2009 4:50 pm ]
Post subject:  RE:Euclid Contest Preparation
I think i ended up with a 6/10 chance, but I rounded down to 3/5. damn Sad

also most of the questions on part B were I think a little bit more advanced than gr9 math, which was all I had going in Very Happy
Author:  A.J [ Fri Feb 27, 2009 5:26 pm ]
Post subject:  Re: Euclid Contest Preparation
insectoid wrote:

Canadian open wasn't hard at all for me. The only questions I didn't get were the ones I hadn't been taught to do.


For a lot of the contests, you don't get 'taught' it in high school at all! Like for example in the AMC, AIME, CMO, and even some questions on the Open, you have to teach yourself the material (well, mainly from past experience in writing these contests and practice)
Author:  Insectoid [ Fri Feb 27, 2009 5:38 pm ]
Post subject:  RE:Euclid Contest Preparation
well, for the open the ones I didn't get involved logarithms and such with words I don't even know that I know you learn in grade 12.
Author:  Alexmula [ Fri Feb 27, 2009 5:48 pm ]
Post subject:  RE:Euclid Contest Preparation
yea for the open challenge you had to know some theorem for the last question on part b that is not taught in high school... from where are we supposed to learn those theorems? :S
Author:  A.J [ Fri Feb 27, 2009 6:03 pm ]
Post subject:  Re: Euclid Contest Preparation
Alexmula wrote:

yea for the open challenge you had to know some theorem for the last question on part b that is not taught in high school... from where are we supposed to learn those theorems? S


not really...it was quite logical. and as for the theorems, you can't just memorize them....you have to grok them Wink
Author:  CodeMonkey2000 [ Fri Feb 27, 2009 8:24 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
insectoid @ Fri Feb 27, 2009 4:43 pm wrote:

there is a 4X4 grid. A token starts in the bottom right corner. It can move 1 place every 'turn' directions up or left, until it hits the top left corner or goes off the grid. What are the odds of it hitting the top left corner?


For all the CS kids; this is a DP problem Razz
Author:  saltpro15 [ Fri Feb 27, 2009 8:35 pm ]
Post subject:  RE:Euclid Contest Preparation
unfortunately, we can't code on the Open, would have made it far easier :p
Author:  CodeMonkey2000 [ Fri Feb 27, 2009 8:52 pm ]
Post subject:  RE:Euclid Contest Preparation
No, but if you used the same concept, it would have been easier (and faster).
Author:  saltpro15 [ Fri Feb 27, 2009 9:07 pm ]
Post subject:  RE:Euclid Contest Preparation
haha I actually tried to solve that problem by counting with my fingers... I got pretty close to the right answer actually lol
Author:  Analysis Mode [ Fri Feb 27, 2009 11:28 pm ]
Post subject:  Re: Euclid Contest Preparation
On the Euclid, there's usually a logarithm question near the end (9 or 10). I was in grade 10 last year and I got 75. I made two stupid errors, one was not reading the question and only answering part of it (it was the area questoin, questoni 4 or 5) and the other one I forget.
Author:  A.J [ Sat Feb 28, 2009 12:27 am ]
Post subject:  Re: Euclid Contest Preparation
Analysis Mode wrote:

On the Euclid, there's usually a logarithm question near the end (9 or 10). I was in grade 10 last year and I got 75. I made two stupid errors, one was not reading the question and only answering part of it (it was the area questoin, questoni 4 or 5) and the other one I forget.


I got the same thing last year on the euclid in grade 10...but for me, I solved #9 but didn't put the answer on the sheet Confused

So I should have gotten in the mid 80's...oh well, life is never fair BooHoo ...
Author:  Analysis Mode [ Sat Feb 28, 2009 12:55 am ]
Post subject:  Re: RE:Euclid Contest Preparation
Alexmula @ Fri Feb 27, 2009 5:48 pm wrote:
yea for the open challenge you had to know some theorem for the last question on part b that is not taught in high school... from where are we supposed to learn those theorems? :S


That theorem is called Apollonius' Theorem (a special case of Stewart's Theorem). you can go look it up. It's funny how I knew that theorem (I memorized a page of triangle and circle theorems that I didn't know, like Brahmagupta's Formula, Ceva's theorem etc. and some kid who was writing the contest that day asked my friend to put up a random theorem on the board and it just so happened to be this one) and didn't get the question. I attribute it to the fact that I misunderstood the question (i thought it meant I had to make a triangle with the midpoints of the triangle and it would be similar, instead of taking the medians and using them). Stewart's theorem makes the first part trivial and the second part easy, but the third part is still difficult.

u can use cosine law though.
Author:  A.J [ Sat Feb 28, 2009 1:31 pm ]
Post subject:  Re: Euclid Contest Preparation
I solved it (after the contest, sadly, since I misunderstood the question just like Analysis Mode did) by reflecting one of the vertex of the triangle and stretching the median to touch the reflected vertex. The diagram then becomes a parallelogram. Then, all you have to use is the property : The sum of squares of diagonals is equal to a sum of squares of four sides.

Using this, you are pretty much done the problem.
Author:  saltpro15 [ Sat Feb 28, 2009 9:30 pm ]
Post subject:  RE:Euclid Contest Preparation
ok, I'm in gr10 this year, I've already finished gr10 academic math, am I eligible for the Euclid? I wrote the open too, I noticed the Waterloo site says gr12 next to Euclid though...
Author:  Analysis Mode [ Sat Feb 28, 2009 10:16 pm ]
Post subject:  Re: Euclid Contest Preparation
Like the COMC, the Euclid is an open contest.
Author:  Analysis Mode [ Sat Feb 28, 2009 10:17 pm ]
Post subject:  Re: Euclid Contest Preparation
well A.J. there's always next year.
Author:  DanielG [ Sat Feb 28, 2009 10:37 pm ]
Post subject:  RE:Euclid Contest Preparation
not if you are in grade 12 Sad
Author:  CodeMonkey2000 [ Sat Feb 28, 2009 10:44 pm ]
Post subject:  RE:Euclid Contest Preparation
Take a fifth year then. Apparently you can take up to 8 years of highschool, and then you need to start paying.
Author:  DanielG [ Sat Feb 28, 2009 10:55 pm ]
Post subject:  RE:Euclid Contest Preparation
already applied (and got accepted) to university, I also can't think of enough courses to take if I did stay.
Author:  A.J [ Sat Feb 28, 2009 11:48 pm ]
Post subject:  Re: Euclid Contest Preparation
DanielG wrote:

already applied (and got accepted) to university, I also can't think of enough courses to take if I did stay.

well...you could always take latin.....but you DON'T want to do that Laughing

Analysis Mode wrote:

well A.J. there's always next year.


I hope so....this year, I made CMO from CMOR (although my mark wasn't high enough even to make CMOR, I had to email Mr.Ian Vanderburgh and asked him if I could Sad)

Next year I would like to make it directly without the hassle of writing the CMOR (although I must admit that I enjoyed the CMOR questions)
Author:  Dark [ Mon Mar 02, 2009 11:02 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
CodeMonkey2000 @ Sat Feb 28, 2009 10:44 pm wrote:
Take a fifth year then. Apparently you can take up to 8 years of highschool, and then you need to start paying.


Wow cool didn't know that lol Mr. Green
Author:  Briggs [ Fri Mar 06, 2009 10:42 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
saltpro15 @ Thu Feb 26, 2009 21:00 wrote:
the Canadian Open was brutal... I'm in gr10 and I wrote it this year, I scored 35/100 Sad


I thought the COMC was out of 80...? (It wasn't brutal, but the last question was. I still managed to score 5 points on it, though... I could have gotten into the CMO if I had the last question. And now that I think about it, my method was wacked out.) Anyway, I'm aiming for 95/100 on the Euclid this year, even if I'm only in grade 10 myself.
Author:  A.J [ Fri Mar 06, 2009 11:19 pm ]
Post subject:  Re: Euclid Contest Preparation
Briggs wrote:

I'm aiming for 95/100 on the Euclid this year, even if I'm only in grade 10 myself.


Yes, and I am aiming to get a 110/100 so that I might have a chance of getting >90 Very Happy
Author:  mono-1-rulz [ Sat Mar 07, 2009 12:44 am ]
Post subject:  RE:Euclid Contest Preparation
wow looking at all the posts...my 58 in the comc looks awfully pale!!! how did people do in the pascal-fermat contests......i didn't do that well!!!
im hoping for better results at Euclid!
Author:  DanielG [ Sat Mar 07, 2009 1:20 am ]
Post subject:  RE:Euclid Contest Preparation
I am aiming for 190/100 and expecting 0/100. hopefully I will get close to the average.
Author:  Briggs [ Sun Mar 08, 2009 5:24 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
DanielG @ Sat Mar 07, 2009 01:20 wrote:
I am aiming for 190/100 and expecting 0/100. hopefully I will get close to the average.


Okay, I think I sparked a few too many sarcastic flames... In that case, I'll raise you 199.

mono-1-rulz @ Sat Mar 07, 2009 00:44 wrote:
wow looking at all the posts...my 58 in the comc looks awfully pale!!! how did people do in the pascal-fermat contests......i didn't do that well!!!
im hoping for better results at Euclid!


I did Cayley. One of the questions looked like it could have been on Project Euler.
Author:  Alexmula [ Sun Mar 08, 2009 6:17 pm ]
Post subject:  Re: Euclid Contest Preparation
do any other universities except for waterloo look at the euclid results? ex. u. of windsor?
Author:  A.J [ Sun Mar 08, 2009 9:48 pm ]
Post subject:  Re: Euclid Contest Preparation
Alexmula wrote:

do any other universities except for waterloo look at the euclid results? ex. u. of windsor?


I believe so, yes. Euclid is a well known contest. Although, I don't know about the scholarships...
Author:  [Gandalf] [ Mon Mar 09, 2009 5:39 am ]
Post subject:  RE:Euclid Contest Preparation
Actually, I doubt it, since only Waterloo gets automatic access to your marks (seeing as how the contest is run by them). I guess the only place it might play a role for other universities is in their equivalent of Waterloo's AIF.
Author:  A.J [ Mon Mar 09, 2009 10:33 am ]
Post subject:  RE:Euclid Contest Preparation
Yes, the AIF would be the place to put it on
Author:  endless [ Thu Apr 02, 2009 10:59 am ]
Post subject:  Re: Euclid Contest Preparation
so it's now getting very close to the contest (next tuesday) and this morning i decided to look up last years average on euclid and these are the numbers i found.


Average (Mean) 46.4
Certificate Cutoff 56
School Medal Cutoff 46
Number of Contestants 16108

does this mean that the average was actually 46.4/100? i mean i know the comc average was in the 40's, but it seemed by looking at previous tests that the euclid would be around a 70 average. just wanting to see if i am reading this correctly.
Author:  A.J [ Thu Apr 02, 2009 4:17 pm ]
Post subject:  RE:Euclid Contest Preparation
the COMC's average was 40/80, whereas the euclid's average is 46.4/100.
Author:  Dark [ Mon Apr 06, 2009 2:28 pm ]
Post subject:  RE:Euclid Contest Preparation
Oh how great, I have a group presentation in English that I can't miss on the morning of the Euclid contest. Now I can't write it, and with my mediocre average, getting into Waterloo is going to be hard
Author:  Horus [ Mon Apr 06, 2009 8:37 pm ]
Post subject:  RE:Euclid Contest Preparation
@ dark just skip it, ur presentation mark probably won't count toward the 2nd term ouac so doesn't matter. just try harder to bring ur marks up later so that ur mark won't drop that much in the final.
I'm also skipping a physics quiz tmr which means 0 on that quiz.




and i was looking at past contests...

did 2008 and 2007 already i estimate i would get 8/10 questions on 2008 and 7/10 questions on 2007 (i counted my answer as right if my steps are right except just made stupid mistakes)

if the pattern follows i would get 9/10 on tmr's euclid Smile
Author:  Alexmula [ Mon Apr 06, 2009 9:03 pm ]
Post subject:  RE:Euclid Contest Preparation
werent u struggling with advanced functions ? Razz im hoping for a 70 at least Laughing
Author:  endless [ Mon Apr 06, 2009 9:08 pm ]
Post subject:  RE:Euclid Contest Preparation
9/10 would be pretty decent haha.
judging by the previous contests, i'm fine until the probability and sequence questions, then i have to grind it out.

bring on lots of trig questions please!


good luck everyone.
Author:  Saad [ Mon Apr 06, 2009 9:29 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
Horus @ Mon Apr 06, 2009 8:37 pm wrote:
@ dark just skip it, ur presentation mark probably won't count toward the 2nd term ouac so doesn't matter. just try harder to bring ur marks up later so that ur mark won't drop that much in the final.


That would be a horrible idea. Marks are still being submitted and the English presentation may or may not be part of the second term university mark. Furthermore, bringing your mark up after suffering a big blow is not as easy as it may seem. Getting a 0 on something significant will probably destroy whatever mark you were trying to achieve and not be able to bring it back. Lastly, English is probably one of the courses that most universities pay the most attention on and so I would not be trying to 'game' it. That would also depend on what mark you are getting since you might risk it if you have a sufficiently high mark in the course - though I don't recommend it.

I would think universities would look more towards your actual marks rather then a contest score (Though, I'm not sure if this is true. Perhaps PR, in the case of waterloo, can give more information there). In conclusion, Dark, do your english presentation since it will probably be more important then your contest score.
Author:  Horus [ Mon Apr 06, 2009 10:02 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
Alexmula @ Mon Apr 06, 2009 9:03 pm wrote:
werent u struggling with advanced functions ? Razz im hoping for a 70 at least Laughing


what do u mean struggling? got 79(.9) first term cause got 50% on trig test (was teacher's fault for forgetting to teach sth) ... pulled my mark up to 87 for the final. and never did my hwk throughout the entire course XD

endless @ Mon Apr 06, 2009 9:08 pm wrote:
9/10 would be pretty decent haha.
judging by the previous contests, i'm fine until the probability and sequence questions, then i have to grind it out.

bring on lots of trig questions please!


good luck everyone.


LOL i'm just the opposite, more probability and less trig plz. and please give a question that would require calculus.... I felt that calculus is so useless when doing the contest. only time i used it is to find the vertex of an equation though if it's in standard form -b/2a is faster.

Saad @ Mon Apr 06, 2009 9:29 pm wrote:
Horus @ Mon Apr 06, 2009 8:37 pm wrote:
@ dark just skip it, ur presentation mark probably won't count toward the 2nd term ouac so doesn't matter. just try harder to bring ur marks up later so that ur mark won't drop that much in the final.


That would be a horrible idea. Marks are still being submitted and the English presentation may or may not be part of the second term university mark. Furthermore, bringing your mark up after suffering a big blow is not as easy as it may seem. Getting a 0 on something significant will probably destroy whatever mark you were trying to achieve and not be able to bring it back. Lastly, English is probably one of the courses that most universities pay the most attention on and so I would not be trying to 'game' it. That would also depend on what mark you are getting since you might risk it if you have a sufficiently high mark in the course - though I don't recommend it.

I would think universities would look more towards your actual marks rather then a contest score (Though, I'm not sure if this is true. Perhaps PR, in the case of waterloo, can give more information there). In conclusion, Dark, do your english presentation since it will probably be more important then your contest score.


not sure about other schools but for our school teachers have already submitted the marks to the main office where they'll be ready to be sent to OUAC by the 17th. for final mark it won't matter that much as long as ur mark won't drop over 5%. the quiz that i'm going to skip will only drop my mark by 3% so basically i can still just maintain my current avg and be ok for university.

For me i think writing the euclid is more important than losing a few % for final mark which universities won't care about...
Author:  A.J [ Mon Apr 06, 2009 10:10 pm ]
Post subject:  RE:Euclid Contest Preparation
guys, dont underestimate the euclid contest...no offense, but don't become overconfident that you'll get 9/10 in the 3 hour time limit (as the questions are quite challenging). although 9/10 is very possible, dont be discouraged if you dont achieve a 90
Author:  saltpro15 [ Tue Apr 07, 2009 8:36 am ]
Post subject:  RE:Euclid Contest Preparation
good luck guys, wish I was writing it too Sad
Author:  bandukda [ Tue Apr 07, 2009 2:49 pm ]
Post subject:  RE:Euclid Contest Preparation
Hi guyz.. Im from Pakistan and will be appearing for the Euclid contests tommorow morning..
I guess the paper may have taken place in Canada (can be wrong).. If so then is there anyone who can help me out what in kind of questionz were asked this year??
Author:  Saad [ Tue Apr 07, 2009 3:02 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
bandukda @ Tue Apr 07, 2009 2:49 pm wrote:
If so then is there anyone who can help me out what in kind of questionz were asked this year??


No, whatever information you need is on the Euclid Contest website.

Also, to people on the forum, seeing as how some people have not written it, please give it one or two days before we start discussing the questions Smile.
Author:  endless [ Tue Apr 07, 2009 3:12 pm ]
Post subject:  RE:Euclid Contest Preparation
yea, how many people saw all of those quantum mechanics questions coming? ouch! ... Laughing
Author:  smoovee [ Tue Apr 07, 2009 5:21 pm ]
Post subject:  Re: Euclid Contest Preparation
uhhh really quick question. I was sick today and didn't go to school. So basically no contest for me anymore right? There's no re-write or anything?
Author:  Dark [ Tue Apr 07, 2009 6:19 pm ]
Post subject:  Re: Euclid Contest Preparation
smoovee @ Tue Apr 07, 2009 5:21 pm wrote:
uhhh really quick question. I was sick today and didn't go to school. So basically no contest for me anymore right? There's no re-write or anything?


Nope, they give out a printout of the contest I believe, so it wouldn't be fair to the first students who wrote it. I wish I could've wrote it Sad
Author:  smoovee [ Tue Apr 07, 2009 6:38 pm ]
Post subject:  Re: Euclid Contest Preparation
Dark @ Tue Apr 07, 2009 6:19 pm wrote:
Nope, they give out a printout of the contest I believe, so it wouldn't be fair to the first students who wrote it. I wish I could've wrote it Sad


boooo, yeah thats what I expected though. Thanks for the reply. Why did you miss yours?
Author:  Horus [ Tue Apr 07, 2009 10:27 pm ]
Post subject:  RE:Euclid Contest Preparation
so... how did u guys do on euclid?

unfortunately i won't be getting 9/10

only did questions 1-7, 9a, 10a and 10c

i also did 8 and 9b but i'm sure those answers are wrong.

Does anyone know how much work you have to show for full solution questions? I'm not sure if i have enough stuff on the answer. For those questions I just wrote out every step in getting into the solution but almost never bothered to explain what i'm doing. my answer is like 95% math and 5% english. while i see the past contests solutions are 75% english 25% math.
Author:  A.J [ Tue Apr 07, 2009 10:36 pm ]
Post subject:  RE:Euclid Contest Preparation
The solutions ought to be very well demonstrated (especially for questions 8 - 10)
Author:  Horus [ Tue Apr 07, 2009 11:42 pm ]
Post subject:  RE:Euclid Contest Preparation
sigh... just realized that i made a really stupid mistake for 9a

when i did cross multiply, i added them instead. but all of my steps are right, if I did multiply instead of add, would have gotten the right answer. How much mark would i get for this question?

also for question 10 i didn't show any step at all... cause I can't really explain how i got the equation. I just thought of it logically and I came up with an equation right away. I'm sure i got 10a and 10c right. though didn't have much step for either of them. wonder how much i'll get....
Author:  A.J [ Wed Apr 08, 2009 10:56 am ]
Post subject:  RE:Euclid Contest Preparation
for 9a, you might get 1 (if not 0) as the cross multiplying is only the start of a whole solution. For 10 a), just an answer should suffice, but for 10 c, you might only get 1 or 2 marks (as I think 10 c is worth about 5).

What is the equation you got, btw?
Author:  endless [ Wed Apr 08, 2009 12:03 pm ]
Post subject:  RE:Euclid Contest Preparation
so are we aloud to talk about it yet?

i seemed to have a lot of trouble with it, mostly from poor time management. ill be happy if i get over 50%.

i was pretty frustrated that i couldn't finish question 6.b), considering those kinds of questions are usually a strength for me.

i'd like to get into details, but don't want to give stuff away to people who may not have written yet.
Author:  mono-1-rulz [ Wed Apr 08, 2009 7:09 pm ]
Post subject:  RE:Euclid Contest Preparation
i got problems 1-7.........had no idea wht to do for 8-10........it was pretty brutal!!
did anyone do the hypatia contest??? i did wayy better on that one.....much easier!
Author:  Saad [ Wed Apr 08, 2009 7:16 pm ]
Post subject:  Re: RE:Euclid Contest Preparation
endless @ Wed Apr 08, 2009 12:03 pm wrote:
so are we aloud to talk about it yet


No. Please refrain until at least midnight of today which makes it one completed day minimum. Thanks Smile
Author:  Analysis Mode [ Wed Apr 08, 2009 7:50 pm ]
Post subject:  Re: Euclid Contest Preparation
Did badly, messed up 5b, 6b, 7a, 7b, 9a, 10a (and I did know how to do all of them). Other than those, i did (successfully) 1,2,3,4,5a,6a.

MAde more mistakes than last year.
Author:  Dark [ Wed Apr 08, 2009 8:00 pm ]
Post subject:  Re: Euclid Contest Preparation
smoovee @ Tue Apr 07, 2009 6:38 pm wrote:
Dark @ Tue Apr 07, 2009 6:19 pm wrote:
Nope, they give out a printout of the contest I believe, so it wouldn't be fair to the first students who wrote it. I wish I could've wrote it Sad


boooo, yeah thats what I expected though. Thanks for the reply. Why did you miss yours?


English presentation on the same morning...grr...
Author:  bandukda [ Thu Apr 09, 2009 1:59 pm ]
Post subject:  RE:Euclid Contest Preparation
do u guyz have ny idea watz the min score required to achieve a scholarship at Waterloo??
because I dont think I'll get nything more than 65 or 70 atmost.. :p
It was a tough paper nd I spent around 20 min solving 8a buh didnt make it..
iz there nyone who did 8a??
Author:  endless [ Fri Apr 10, 2009 3:22 pm ]
Post subject:  RE:Euclid Contest Preparation
so i guess we can talk about details now.
what did you guys get for the integer n where 100<n<999 sum of digits is 24?

i got 10/899, but probabilities aren't my forte, so wanting to know if i made a stupid mistake.
Author:  Analysis Mode [ Fri Apr 10, 2009 3:32 pm ]
Post subject:  Re: Euclid Contest Preparation
There are 900 numbers, not 899, because the range includes 100. and it's 100<=n<=999.

it's 10/900 or 1/90.
Author:  endless [ Fri Apr 10, 2009 3:36 pm ]
Post subject:  Re: Euclid Contest Preparation
Analysis Mode @ Fri Apr 10, 2009 3:32 pm wrote:
There are 900 numbers, not 899, because the range includes 100. and it's 100<=n<=999.

it's 10/900 or 1/90.


lol, ouch. i had a feeling that i got that wrong, but by that time i was doing quick answers for the short answers, and trying to scribble stuff down for the long answer questions i hadn't done yet.
Author:  endless [ Fri Apr 10, 2009 3:56 pm ]
Post subject:  RE:Euclid Contest Preparation
so how did you guys do 6. b), the physics question?

the closest i got was carrying v on the distance through until it cancelled out, but my answer was unrealistic.
Author:  CodeMonkey2000 [ Fri Apr 10, 2009 5:00 pm ]
Post subject:  RE:Euclid Contest Preparation
You know GF is 45km (60*45/60), so let t be the time the two took to intersect, and x be Bob's speed. You know that x*t=45 and 60t+45=45+20/60x (total distance traveled). You have 2 equations, so solve for x, which is 90km/h

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