Search found 16 matches
Probability with dices
37. Tossing two dices at random, what is the probability that the sum of numbers upside is greater than 9? (A)2/9 (B) 7/36 (C) 5/36 (D) 1/6 (E) 1/9 [spoiler]OA: D[/spoiler] This problem look pretty straightforward at first. These are the possibilities for dices: 1,2,3,4,5,6. The only dices faces tha...
- by Cedagmat
Fri Nov 26, 2010 7:30 pm- Forum: Problem Solving
- Topic: Probability with dices
- Replies: 1
- Views: 1295
Sorry I do not have the solution to the problem only the answer. I was pretty stumped on this question because it seems to missing a piece of information.
- by Cedagmat
Mon Nov 15, 2010 7:17 pm- Forum: Problem Solving
- Topic: Word Problem (Overlapping Set and Volume)
- Replies: 5
- Views: 1829
Word Problem (Overlapping Set and Volume)
Of the employees in a company, 30 % are female who have a master degree. If 20 % of the female employees do not have a master degree, what percent of the employees in the company are female? (A) 25 % (B) 30 % (C) 32.5 % (D) 37.5 % (E) 45 % [spoiler]Answer: B[/spoiler] I can't seem to breakdown this ...
- by Cedagmat
Mon Nov 15, 2010 2:56 pm- Forum: Problem Solving
- Topic: Word Problem (Overlapping Set and Volume)
- Replies: 5
- Views: 1829
Remainders, Probability, and Number Property
242. If x and y are positive integers, is x – y divisible by 4? (1) xy is divisible by 16. (2) x is divisible by 4. [spoiler]Answer: E[/spoiler] S1) xy can be 16 = (1,16), (2,8), (4,4) xy can be 32=(1, 32), (2, 16), (4, 8) xy can be 48=(1, 48), (2, 24), (3, 16), (4, 8) (x-y) can be divisible by 4,...
- by Cedagmat
Mon Nov 15, 2010 2:33 pm- Forum: Data Sufficiency
- Topic: Remainders, Probability, and Number Property
- Replies: 2
- Views: 1170
That answered my question. I though that -m meant that m was a negative number, but I see your point about it being an expression. That definitely explains my error.
- by Cedagmat
Mon Nov 15, 2010 9:48 am- Forum: Data Sufficiency
- Topic: Coordinate Geometry Problem
- Replies: 4
- Views: 2053
Interest Rate Annual Compound
205. Mike invested a total of $ 5,000 at 5 % simple annual interest rate for n years. Is n > 4? S1. At the end of n years, Mike’s investment plus interest was more than $ 5, 500. S2. At the end of n years, Mike’s investment plus interest was less than $ 6,500. [spoiler]Answer: E[/spoiler] Set up...
- by Cedagmat
Sun Nov 14, 2010 11:30 am- Forum: Data Sufficiency
- Topic: Interest Rate Annual Compound
- Replies: 1
- Views: 1686
So in this case, it does not matter that that problem has stated that the signs associated with m and n?
- by Cedagmat
Sun Nov 14, 2010 11:26 am- Forum: Data Sufficiency
- Topic: Coordinate Geometry Problem
- Replies: 4
- Views: 2053
Coordinate Geometry Problem
179. If line l passes through point (m,– n), is the slope of the line negative? (1) The line passes through point (–m, n). (2) m^n is negative. Answer: E S1: If we solve for the slope which is rise/run--> slope = (-n-n)/(m- -m)= -(n/m) which is by definition a negative slope. Sufficient. S2: Thi...
- by Cedagmat
Sat Nov 13, 2010 5:05 pm- Forum: Data Sufficiency
- Topic: Coordinate Geometry Problem
- Replies: 4
- Views: 2053
Going over your posts, I realized one of the biggest mistakes I always make in reading world problems, not reading the information correctly. (i.e. I calculated the wrong profit margins and threw my entire solution off).
- by Cedagmat
Sat Nov 13, 2010 3:29 pm- Forum: Data Sufficiency
- Topic: Word Problems with Ratios and Remainders
- Replies: 26
- Views: 15786
Word Problems with Ratios and Remainders
The original cost for paperback copy and hardback copy is $8 and $9.5, respectively. The sales price for the paperback copy and hardback copy is $10 and $13, respectively. If a total of 834 books were sold out, was the total profit greater than $2,000? (1) More paperback copies were sold. (2) At lea...
- by Cedagmat
Fri Nov 12, 2010 11:30 am- Forum: Data Sufficiency
- Topic: Word Problems with Ratios and Remainders
- Replies: 26
- Views: 15786
Number Properties of Primes
81. If n is an integer greater than 1, and n is not a prime number, then which of the following must be true? (A) n is the sum of three prime numbers (B) n is the difference between 2 even numbers (C) n is the difference between one even number and one odd number (D) n is the product of one even num...
- by Cedagmat
Thu Nov 11, 2010 2:40 pm- Forum: Problem Solving
- Topic: Number Properties of Primes
- Replies: 3
- Views: 1172
Simplify the Expressions
90. If 0 < n < m < 1, m^2 – n^2 must be less than which of the following expressions?
(A) m – n
(B) (m+n)/2
(C) mn
(D) (m + n)^2
(E) (m – n)^2
OA is D.
Is there any way to simplify these expression to make the solution easier than plugging in numbers?
- by Cedagmat
Thu Nov 11, 2010 2:07 pm- Forum: Problem Solving
- Topic: Simplify the Expressions
- Replies: 6
- Views: 1275
Powers and inequalities
74. Is k^(m + n) > 0? (1) k < 0. (2) k^(m – n) < 0. OA is E. I first simplified the question to: K^m(K^n)>0, which means that either K^m and K^n are both negative, or K^m and K^n are both positive. S1: k<0, insufficient since it does not tell us about m or n. S2: Simplify into K^m/K^n<0. This mean...
- by Cedagmat
Wed Nov 10, 2010 8:36 pm- Forum: Data Sufficiency
- Topic: Powers and inequalities
- Replies: 3
- Views: 1398
II) i) The statement which provides value of x-y will be sufficient. Product x*y =7; As 7 is prime number, this means that either x=7, y=1 or y=7, x=1; either way the difference will be 6 or -6 and raising this to even power will be a positive number. ii) x+y does not provide any information to get...
- by Cedagmat
Wed Nov 10, 2010 8:19 pm- Forum: Data Sufficiency
- Topic: Tricky Number Properties and Algebra
- Replies: 5
- Views: 1281
Tricky Number Properties and Algebra
I only have the OA to these but not the explanations. Help! If x and у are none negative integer, what is the value of xy? (1) 7^x = 13^y. (2) 3^x = 9^y. [spoiler]Answer: A[/spoiler] s1: Since only 7^0 and and 13^0 can be equal to each other, I thought x and y would be 0. Sufficient. s2: 3^2 = 9^1,...
- by Cedagmat
Wed Nov 10, 2010 5:51 pm- Forum: Data Sufficiency
- Topic: Tricky Number Properties and Algebra
- Replies: 5
- Views: 1281