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Positives and Negatives

A certain list consists of several different integers. Is the product of all the integers in the list positive?

1. The product of the greatest and smallest of the integers in the list is positive.

2. There is an even number of integers in the list.

OA = C

by tonebeeze

Sun May 22, 2011 11:38 am
Forum: Data Sufficiency
Topic: Positives and Negatives
Replies: 3
Views: 1352

GMAT Prep - Exponents and Factoring

What is the best way not to get tripped up or slowed down by these problems?

{(1000)^2 - (999)^2} / {(101)^2 - (99)^2} =

a. 10
b. 20
c. 40
d. 80
e. 100

OA = 10

by tonebeeze

Fri May 20, 2011 12:44 pm
Forum: Problem Solving
Topic: GMAT Prep - Exponents and Factoring
Replies: 1
Views: 1376

GMAT Prep - Direct Proportions

Can someone walk me through this problem. Thanks. The rate of a chemical reaction is directly proportional to the square of concentration of chemcial A present and invesrsly proportional to the concentration of chemical B present. If chemical B is increased by 100% which of the following is the chan...

by tonebeeze

Fri May 20, 2011 12:06 pm
Forum: Problem Solving
Topic: GMAT Prep - Direct Proportions
Replies: 3
Views: 1517

GMAT Prep Overlapping Sets Problem

I am interested to seeing the different approaches to solving this problem: A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from the 100 ...

by tonebeeze

Fri May 20, 2011 9:54 am
Forum: Problem Solving
Topic: GMAT Prep Overlapping Sets Problem
Replies: 3
Views: 1286

If progressed through the following deductions:
sqrt(x)/2 = 2x
sqrt(x) = 4x

then tested the answer choices, which saved me a lot of time. Does anyone else have any quick approaches to solving this problem?

by tonebeeze

Tue May 17, 2011 8:15 am
Forum: Problem Solving
Topic: GMAC paper test WT practice
Replies: 3
Views: 1277

Triangle Practices

Can someone walk me through this problem. thanks.

OA = B

by tonebeeze

Mon May 16, 2011 4:10 pm
Forum: Problem Solving
Topic: Triangle Practices
Replies: 3
Views: 1243

Algebra practice

If 2/x + 3/y = 4 and xy = 5, then 3x + 2y =

a. 1/5
b. 1/4
c. 4/5
d. 4
e. 20

OA = E

by tonebeeze

Mon May 16, 2011 3:55 pm
Forum: Problem Solving
Topic: Algebra practice
Replies: 2
Views: 1086

Rates GMAC paper text problem

The time it took car A to travel 400 miles was 2 hours less than the time it took car B to travel the same distance. If car A's average speed was 10 miles per hour greater than that of car B, what was car B's average speed, in miles per hour?

a. 20
b. 30
c. 40
d. 50
e. 80

OA = C

by tonebeeze

Mon May 16, 2011 3:47 pm
Forum: Problem Solving
Topic: Rates GMAC paper text problem
Replies: 1
Views: 903

Interest Problem

If x dollars is invested at 10 percent for one year and y dollars is invested at 8 percent for one year, the annual income from the 10 percent investment will exceed the annual income from the 8 percent investment by $56. If $2,000 is the total amount invested, how much is invested at 8 percent? a. ...

by tonebeeze

Mon May 16, 2011 3:40 pm
Forum: Problem Solving
Topic: Interest Problem
Replies: 1
Views: 919

Good Number Properties Problem from GMAC paper test

Can someone walk me through this one. thanks


If x, y, and z are positive integers and 3x = 4y = 7z, then the least possible value of x + y + z is

a. 33
b. 40
c. 49
d. 61
e. 84

OA = D

by tonebeeze

Mon May 16, 2011 2:43 pm
Forum: Problem Solving
Topic: Good Number Properties Problem from GMAC paper test
Replies: 2
Views: 1409

Ratios from GMAC paper test

If 5x = 6y and xy ≠ 0, what is the ratio of 1/5x to 1/6 y?

a. 25/6
b. 36/25
c. 6/5
d. 5/6
e. 25/36

by tonebeeze

Mon May 16, 2011 2:39 pm
Forum: Problem Solving
Topic: Ratios from GMAC paper test
Replies: 2
Views: 1181

GMAC paper test WT practice

If x is a positive number and 1/2 the square root of x is equal to 2x, then x =

a. 1/16
b. 1/4
c. 1/2
d. 2
e. 8

OA = A

by tonebeeze

Mon May 16, 2011 2:37 pm
Forum: Problem Solving
Topic: GMAC paper test WT practice
Replies: 3
Views: 1277

Got it. the key was combining the equations:

"2g-t=9000, and from problem
t+g=6000 "

Thanks!

by tonebeeze

Wed May 11, 2011 11:00 am
Forum: Data Sufficiency
Topic: DS algebraic translation practice. Sam's spending.
Replies: 2
Views: 891

In simplifying the problem, can you review this step:

"C = 6.5X + 8.5 (1-X) --->X = (8.5 - C)/2.5 "

thanks

by tonebeeze

Wed May 11, 2011 10:56 am
Forum: Data Sufficiency
Topic: Coffee Blend
Replies: 4
Views: 1495

GMAC Paper Test: Weighted Averages

If a certain grove consists of 36 pecan trees, what was the yield per tree last year?

1. The yield per tree for the 18 trees in the northern half of the grove was 60 kilograms last year.

2. The yield per tree for the 18 trees in the eastern half of the grove was 55 kilograms last year.

OA = E

by tonebeeze

Wed May 11, 2011 10:30 am
Forum: Data Sufficiency
Topic: GMAC Paper Test: Weighted Averages
Replies: 1
Views: 1078