Search found 70 matches
A link would be cool. I can't seem to find what you are referring to.palvarez wrote:Guys, master this type of problems. Learn allegation rule found in books.google.com. Allegation rule is a figurative way of solving algebraically.
Thanks for the help though.
- by chipbmk
Wed Nov 18, 2009 3:30 pm- Forum: Data Sufficiency
- Topic: % Mixture Problem
- Replies: 5
- Views: 6968
% Mixture Problem
A contractor combined x tons of gravel mix that contained 10% gravel G by weight, with y tons of a mixture that contained 2% gravel G by weight to produce z tons of a mixture that was 5% gravel G by weight. What is the value of x? 1) y = 10 2) z = 16 OA: D I do not understand how the OA is correct ...
- by chipbmk
Wed Nov 18, 2009 12:34 pm- Forum: Data Sufficiency
- Topic: % Mixture Problem
- Replies: 5
- Views: 6968
If m, n, and p are integers, is m + n odd? (1) m = p^2 + 4p + 4 (2) n = p^2 + 2m + 1 Not sure how go about this one ? Rephrase it m+n = 1 (mod 2) 1. m = p^2 + 4p +4 m = p^2 (mod 2) 2. n = p^2 + 1 (mod 2) m +n = 2p^2 + 1 = 1 (mod 2). Get rid of the junk in "rephrasing phase" itself. Carryi...
- by chipbmk
Wed Nov 18, 2009 12:12 pm- Forum: Data Sufficiency
- Topic: Algebra
- Replies: 10
- Views: 1704
M+Z > 0?
Is m + z > 0?
1. m – 3z > 0
2. 4z – m > 0
OA: C
Detailed responses would be helpful, thanks!
I got this one right, but I had to basically guess ... I am not sure how to justify it.
- by chipbmk
Wed Nov 18, 2009 11:59 am- Forum: Data Sufficiency
- Topic: M+Z > 0?
- Replies: 1
- Views: 3106
You are correct, it is 2x-2y = 1 ... I dont know what happened when I copied and pasted it.2010gmat wrote:i have seen a similar question where 1. is 2x - 2y = 1 .... are your sure 1. says 2x.2y = 1???
Solutions?
- by chipbmk
Wed Nov 18, 2009 8:32 am- Forum: Data Sufficiency
- Topic: X and Y both positive?
- Replies: 4
- Views: 3683
Thanks again! You are awesome!papgust wrote:5^21 * 4^11 = 2 * 10^n
5^21 * 2^22 = 2 * 2^n * 5^n
5^21 * 2^22 = 2^(n+1) * 5^n
I had gotten it as far as I bolded above, but I did not know how to compare the two different things, now I know you can split them out separately.
Thanks!
- by chipbmk
Tue Nov 17, 2009 10:18 pm- Forum: Problem Solving
- Topic: Exponents
- Replies: 3
- Views: 1134
So the primes of 264600 are 2, 2, 2, 3, 3, 3, 5, 5, 7, 7 combinations that don't make 6 are (a) the 2s 5s 7s (b) 3s 5s 7s (a) 2^3 * 5^2 * 7^2 = 36 combinations (b) 3^3 * 5^2 * 7^2 = 36 combinations Can someone please explain how you get 36 combinations from 2^3 * 5^2 * 7^2? I do not get it .... tha...
- by chipbmk
Tue Nov 17, 2009 10:15 pm- Forum: Problem Solving
- Topic: Manhattan Challenge Problem
- Replies: 23
- Views: 8488
Number Properties - 75 rewritten
75 can be written as the sum of the squares of 3 different positive integers. What is sum of these integers? a. 17 b. 16 c. 15 d. 14 e. 13 OA: E I ended up getting this answer correct, but I had to use guess and check. I am assuming there is an easier way to figure this out using number properties! ...
- by chipbmk
Tue Nov 17, 2009 10:13 pm- Forum: Problem Solving
- Topic: Number Properties - 75 rewritten
- Replies: 1
- Views: 942
X and Y both positive?
Are x and y both positive?
a. 2x – 2y = 1
b. x�y > 1
OA: C
Detailed explanations would be helpful! Thanks 
- by chipbmk
Tue Nov 17, 2009 10:11 pm- Forum: Data Sufficiency
- Topic: X and Y both positive?
- Replies: 4
- Views: 3683
College Teachers
Of 1400 college teachers surveyed, 42% said they considered research essential. How many teachers surveyed were women? a. In survey 36% of men and 50% of women said they considered research essential b. 288 men said they considered research essential OA: A I understand in theory why the answer is wh...
- by chipbmk
Tue Nov 17, 2009 10:09 pm- Forum: Data Sufficiency
- Topic: College Teachers
- Replies: 3
- Views: 3126
Even Integer N - Function Question
For every positive even integer n, the function h(n) is defined to be the product of all even integers from 2 to n inclusive. If p is the smallest prime factor of h(100) + 1, then p is between a. 2 and 10 b. 10 and 20 c. 20 and 30 d. 30 and 40 e. > 40 OA: E I think I have seen this one posted before...
- by chipbmk
Tue Nov 17, 2009 10:05 pm- Forum: Problem Solving
- Topic: Even Integer N - Function Question
- Replies: 1
- Views: 1477
Exponents
If 5^21 * 4^11 = 2 * 10^n , what is n?
a. 11
b. 21
c. 22
d. 23
e. 32
OA: B
Please give a detailed explanation of how to solve.
Thanks!
- by chipbmk
Tue Nov 17, 2009 10:00 pm- Forum: Problem Solving
- Topic: Exponents
- Replies: 3
- Views: 1134
So the primes of 264600 are 2, 2, 2, 3, 3, 3, 5, 5, 7, 7 combinations that don't make 6 are (a) the 2s 5s 7s (b) 3s 5s 7s (a) 2^3 * 5^2 * 7^2 = 36 combinations (b) 3^3 * 5^2 * 7^2 = 36 combinations Can someone please explain how you get 36 combinations from 2^3 * 5^2 * 7^2? I do not get it .... tha...
- by chipbmk
Tue Nov 17, 2009 8:13 am- Forum: Problem Solving
- Topic: Manhattan Challenge Problem
- Replies: 23
- Views: 8488
I know this may seem like a really dumb question.
But can someone please show me how you would choose numbers and plug in for this question. Should you choose numbers for all the variables except for Distance, since that is what the question is asking us to solve for?
Thanks!
- by chipbmk
Sun Nov 15, 2009 7:46 pm- Forum: Problem Solving
- Topic: VIC - Best Way To Solve?
- Replies: 8
- Views: 4144
Sucks to not be a programmer trying to do that problem.
I thought that read Xfactorial ... made the problem much harder.
- by chipbmk
Thu Nov 12, 2009 3:13 pm- Forum: Data Sufficiency
- Topic: X - Y > X + Y?
- Replies: 13
- Views: 2274