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man, i think i just got it. something wasn't clicking right - so the question is: is the absolute value of X = y - z? yes/no. s1) X + Y = Z -> rewrite to get X, to see if X = Y - Z. X = Z - Y when X is positive X = Y - Z when X is negative (right?) since it can be both - insufficient. s2) X < 0 X m...

by dtweah

Thu May 19, 2011 4:17 am
Forum: Problem Solving
Topic: OG11 - DS 105
Replies: 4
Views: 1460

The key to solving this is the following sentence: The gender distribution for finance majors and non-finance majors is the same We know that 40% of the total students are female. That means 40% of the finance majors are female and 40% of the non-finance majors are female. Therefore, 60% of all non...

by dtweah

Thu Apr 28, 2011 6:05 am
Forum: Problem Solving
Topic: Investing
Replies: 29
Views: 13650

A weakens BC higher pop does not mean people are reading newspaper vice versa.

by dtweah

Sat Apr 23, 2011 5:59 pm
Forum: Critical Reasoning
Topic: OG Q - Newspaper in town S & T
Replies: 2
Views: 1303

Let X be volume of mixture 1 and Y be volume of mixture 2 I II W O W O 5X/12 7X/12 7Y/9 2Y/9 Combine the 2 mixtures. Add the water parts and orange parts and form the required ratio (5X/12 + 7Y/9 )/(7X/12 + 2Y/9) =3/4 20x/12 +28y/9 =21x/12 + 6y/9 ( Cross multiply but don't Simplify anything!!) X/12=...

by dtweah

Mon Apr 04, 2011 7:44 am
Forum: Problem Solving
Topic: a ps from gmat club
Replies: 4
Views: 1647

Running at their respective constant rates, Machine x takes 2 days longer to produce w widgets than Machine Y. At these rates, if the two machines together produce 5/4w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets? A)4 B)6 C)8 D)10 E)12 I tried to use a diffe...

by dtweah

Sun Aug 15, 2010 6:03 am
Forum: Problem Solving
Topic: Running at their respective constant rates
Replies: 7
Views: 3214

Counting

From city A to city B there are 3 different routes. From B to C there are 5. From C to D there are 2. Laxman has to go from A to D attending some work in city B and C on the way and has to come back in the reverse order. In how many ways can he complete this journey if he has to take a different rou...

by dtweah

Sun Aug 15, 2010 5:18 am
Forum: Problem Solving
Topic: Counting
Replies: 1
Views: 1235

In a town of 3000 people, 600 are over 50 years old and 1000 are female. It is known that 30% of the female are over 50 years. What is the probability that the person chosen at random is either a female or over 50 years? A. 11:13 B. 13:17 C. 2:3 D. 9:17 E. 13:9 [spoiler]http://www.greguide.com/Free...

by dtweah

Sun Aug 15, 2010 4:08 am
Forum: Problem Solving
Topic: Probability involving 'EITHER OR'
Replies: 5
Views: 4901

The probability of picking an apple from a basket is .25 and that of picking a rotten fruit is .50. The probability of picking a rotten apple is .14. Find the prob that neither an apple nor a rotten fruit is picked. A. .75 B. .39 C. .25 D. .5 E. .61 [spoiler]http://www.greguide.com/Free-GRE-Practic...

by dtweah

Sat Aug 14, 2010 7:31 pm
Forum: Problem Solving
Topic: For the probability maestros
Replies: 3
Views: 1695

In an essay competition the odds against competitors A, B, C, D are 2;1, 3;1, 4;1 and 5;1. Find the probability that one of them wins the competition? A. 11/ 120 B. 114/120 C. 127/140 D. 2/17 E. 135/157 [spoiler]http://www.greguide.com/Free-GRE-Practice-Tests/Problem-Solving-GRE-Practice-Test-5.htm...

by dtweah

Sat Aug 14, 2010 7:29 pm
Forum: Problem Solving
Topic: Odds and Probability
Replies: 5
Views: 6510

For the probability maestros

The probability of picking an apple from a basket is .25 and that of picking a rotten fruit is .50. The probability of picking a rotten apple is .14. Find the prob that neither an apple nor a rotten fruit is picked. A. .75 B. .39 C. .25 D. .5 E. .61 [spoiler]http://www.greguide.com/Free-GRE-Practice...

by dtweah

Sat Aug 14, 2010 3:21 pm
Forum: Problem Solving
Topic: For the probability maestros
Replies: 3
Views: 1695

Odds and Probability again

The odds that Amit speaks the truth are 1:2 and the odds that Bunty speaks the truth are 2:3. What is the probability that exactly one of Amit is speaking the truth? A. 3/5 B. 4/15 C. 7/15 D. 4/7 E. 3/7 [spoiler]http://www.greguide.com/Free-GRE-Practice-Tests/Problem-Solving-GRE-Practice-Test-5.html...

by dtweah

Sat Aug 14, 2010 3:15 pm
Forum: Problem Solving
Topic: Odds and Probability again
Replies: 1
Views: 4324

Probability

The probability that amit will qualify in an exam is .05. The probability that anita will qualify is .10. The probability that both will qualify is .02. Find the percent chances of both failing to qualify.

A. 50%

B. 25.5%

C. 37%

D. 53%

E. 87%

by dtweah

Sat Aug 14, 2010 3:11 pm
Forum: Problem Solving
Topic: Probability
Replies: 1
Views: 2970

Probability involving 'EITHER OR'

In a town of 3000 people, 600 are over 50 years old and 1000 are female. It is known that 30% of the female are over 50 years. What is the probability that the person chosen at random is either a female or over 50 years? A. 11:13 B. 13:17 C. 2:3 D. 9:17 E. 13:9 [spoiler]http://www.greguide.com/Free-...

by dtweah

Sat Aug 14, 2010 3:08 pm
Forum: Problem Solving
Topic: Probability involving 'EITHER OR'
Replies: 5
Views: 4901

Odds and Probability

In an essay competition the odds against competitors A, B, C, D are 2;1, 3;1, 4;1 and 5;1. Find the probability that one of them wins the competition? A. 11/ 120 B. 114/120 C. 127/150 D. 2/17 E. 135/157 [spoiler]http://www.greguide.com/Free-GRE-Practice-Tests/Problem-Solving-GRE-Practice-Test-5.html...

by dtweah

Sat Aug 14, 2010 3:03 pm
Forum: Problem Solving
Topic: Odds and Probability
Replies: 5
Views: 6510

While working alone at their respective constant rates, computer x processes 240 files in 4 hours and computer Y processes 240 files in 8 hours. If all files processed by these computers are same size, how long would it take the two computers, working at the same time and at their respective consta...

by dtweah

Sat Aug 14, 2010 2:57 pm
Forum: Problem Solving
Topic: GMAT Prep question
Replies: 13
Views: 5458