Search found 10 matches


Probability

Albert, Becky and Claire apply for research grants for the government. If each has a distinct probability for success, 2/5, 1/3 and 5/6 respectively, What is the probability that Albert and Becky will receive the grant but Claire wont?

a. 11/6
b. 7/12
c. 1/9
d. 1/45
e. 1/90

Answer D

by ornelaspedro

Tue Aug 11, 2009 9:00 am
Forum: Problem Solving
Topic: Probability
Replies: 1
Views: 1183

Fractions

The public library has exactly 2 floors. It has 2/3 as many shelves in its second floor as it does on its first. If the second floor has 5/6 as many books per shelf as the fist floor, what fraction of the library's books are in the first shelf.

a. 1/4
b. 5/5
c. 5/9
d. 9/14
e. 5/6

D

by ornelaspedro

Tue Aug 04, 2009 7:59 am
Forum: Problem Solving
Topic: Fractions
Replies: 2
Views: 1541

Reply

If you square both terms you get (x+4)^2 = 9
Solve x^2 + 8x + 7 = 0
(x + 7) ( x + 1 ) = 0
x = - 7 x = - 1
Hence, x - 4 can be either -11 or -5
What's the correct answer?

by ornelaspedro

Sat May 02, 2009 8:52 am
Forum: Problem Solving
Topic: Tricky root of a square
Replies: 2
Views: 1257

Algebra, exponents,

For every integer k 1 to 10, inclusive, the kth term of a certain sequence given by (-1)^k + 1 (1/2^k). If T is the sum of the first 10 terms in the sequence, then T is greater than 2 between 1 and 2 between 1/2 and 1 between 1/4 and 1/2 less than 1/4 The answer is D can anybody show me a good appro...

by ornelaspedro

Sat May 02, 2009 8:41 am
Forum: Problem Solving
Topic: Algebra, exponents,
Replies: 1
Views: 1288

Inequality, graphs

Which of the following inequalities has a solution set that, when graphed on the number line, is a single line segment of finite length. x^4 >or equal to 1 x^3 <or equal to 27 x^2 > or equal to 16 2 <or equal to abs value of x <or equal to 5 2 <or equal to 3x + 4 <or equal to 6 The answer is E. Coul...

by ornelaspedro

Sat May 02, 2009 8:27 am
Forum: Problem Solving
Topic: Inequality, graphs
Replies: 1
Views: 1726

Exponents, Value of N

IF 5^21 x 4^11 = 2 x 10^n what is the value of n?

11
21
22
23
32

The answer is 21 could somebody explain why?

by ornelaspedro

Sat May 02, 2009 8:22 am
Forum: Problem Solving
Topic: Exponents, Value of N
Replies: 1
Views: 1144

Inequality

If x and y are integers, what is the value of x + y ?

690 < x < y < 696

692 < x < y < 695

The solution is B, could anybody explain how you come to this conclusion?

by ornelaspedro

Sat May 02, 2009 8:13 am
Forum: Data Sufficiency
Topic: Inequality
Replies: 1
Views: 1072

Post subject: Re: Algebra question

I know !!! It makes no sense to me either. I got this question on the gmatprep practice test one. That's all the information you are given. Anyways, if you can think of something I would really appreciate it.

by ornelaspedro

Thu Apr 30, 2009 3:59 pm
Forum: Problem Solving
Topic: Algebra question
Replies: 4
Views: 1157

Algebra question

For which of the following functions is f(a+b) = f(a) + f(b) for all positive numbers a and b?

The answer is -3x. Could anybody show me how to get to the answer.

by ornelaspedro

Thu Apr 30, 2009 3:38 pm
Forum: Problem Solving
Topic: Algebra question
Replies: 4
Views: 1157

Algebra question

Can anybody tell me how to solve this; If xy + z = x(y + z), which of the following must be true? a) x = 0 and z = 0 b) x = 1 and y = 1 c) y = 1 and z = 0 d) x = 1 and y =0 e) x = 1 and z = 0 The answer is E, I solved for x and got one, however, I'm uncertain on how the answer is z = 0 and not y = 0

by ornelaspedro

Wed Apr 29, 2009 7:02 pm
Forum: Problem Solving
Topic: Algebra question
Replies: 4
Views: 1264