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GMAT Books - Complete Set - $100
I am selling the following GMAT books: Quantitative: Manhattan GMAT - Foundations of GMAT Math ISBN: 978-0-9841780-0-1 Manhattan GMAT - Number Properties ISBN: 978-009824238-4-4 Manhattan GMAT - Fractions, Decimals & Percents ISBN: 978-0-9824238-2-0 Manhattan GMAT - Equations, Inequalities, &...
- by Bens4vcobra
Tue Aug 09, 2011 5:33 pm- Forum: GMAT Books for Sale/Donation
- Topic: GMAT Books - Complete Set - $100
- Replies: 1
- Views: 1748
How many positive integers in a set?
Set S consists of 20 different positive integers. How many of the intergers in S are odd? (1) 10 of the integers in S are even (2) 10 of the integers in S are multiples of 4 The answer is A but it seems like you have to assume all integers of S aren't even. No other constraints are given to justify ...
- by Bens4vcobra
Fri Jul 08, 2011 7:33 am- Forum: Data Sufficiency
- Topic: How many positive integers in a set?
- Replies: 3
- Views: 1391
answer is 1/(1-1/5)=1.2 This is what I thought as well. But the correct answer is 1.25x. Hi, Both of you must have made calculation mistakes. 1/(1-1/5) = 1/(4/5) = 5/4 = 1.25 Could you explain how you came up with "1/(1-1/5)" ? I understand the calculation you performed, however, I'm not ...
- by Bens4vcobra
Wed Jul 06, 2011 5:50 am- Forum: Problem Solving
- Topic: Percents/Algebra Word Translation
- Replies: 7
- Views: 1636
Could you explain a5 = (2^4)a1 = 16a1 a little further? I'm not seeing where that is coming from.Frankenstein wrote:Hi,
a2 = 2a1,
a5 = (2^4)a1 = 16a1
a5 - a2 =12
So, 16a1 - 2a1 = 12 => a1 = 6/7
Hence, E
- by Bens4vcobra
Tue Jul 05, 2011 10:03 am- Forum: Problem Solving
- Topic: Sequence Problem
- Replies: 8
- Views: 1778
This is what I thought as well. But the correct answer is 1.25x.worldpeace93 wrote:answer is 1/(1-1/5)=1.2
- by Bens4vcobra
Tue Jul 05, 2011 9:17 am- Forum: Problem Solving
- Topic: Percents/Algebra Word Translation
- Replies: 7
- Views: 1636
I understand the problem fairly well. n must be at least -1/11. But here's where I am confused: doesn't the reciprocal also mean the sign changes? So -1/11 becomes 11 so E should be the answer, but A is the answer. The only way A is correct is if the sign doesn't change. But when dealing with recip...
- by Bens4vcobra
Tue Jul 05, 2011 9:09 am- Forum: Problem Solving
- Topic: Number Line Word Problem
- Replies: 6
- Views: 2351
For these questions involving overlapping sets, I like to use the Double Matrix method. (see video at: http://www.beatthegmat.com/mba/2011/05/05/random-double-matrix-question-1) A lot of people use Venn diagrams, but I think Venn diagrams aren't as useful for keeping track of information when the q...
- by Bens4vcobra
Tue Jul 05, 2011 9:05 am- Forum: Problem Solving
- Topic: Probability Word Problem
- Replies: 4
- Views: 1183
I agree with Uri that we need to know that all of the numbers in the set are integers in order for the first statement to be sufficient. I've seen the question before, and I think it does say 'positive integers' rather than 'positive numbers', so I expect that's a transcription error in the origina...
- by Bens4vcobra
Tue Jul 05, 2011 6:44 am- Forum: Data Sufficiency
- Topic: odd /even ? on a set of number !!!
- Replies: 14
- Views: 4640
Probability Word Problem
A certain manufacturer of cake, muffin and bread mixes has 100 buyers, 50 of whom buy cake mix, 40 muffin mix and 20 buy both cake and muffin mix. If a buyer is to be selected at random from 100 buyers, what is the probability that the buyer will be one who purchases neither cake nor muffin mix? A)1...
- by Bens4vcobra
Tue Jul 05, 2011 6:18 am- Forum: Problem Solving
- Topic: Probability Word Problem
- Replies: 4
- Views: 1183
Number Line Word Problem
If n denotes a number to the left of 0 on the number line such that the square of n is less than 1/100, then the reciprocal of n must be A) less than -10 B) Between -1 and -1/10 C) between -1/10 and 10 D) between 0 and 1/10 E) Greater than 10 I understand the problem fairly well. n must be at least ...
- by Bens4vcobra
Tue Jul 05, 2011 6:10 am- Forum: Problem Solving
- Topic: Number Line Word Problem
- Replies: 6
- Views: 2351
Percents-Price Word Translation
A certain candy manufacturer reduced the weight of Candy Bar M by 20% but left the price unchanged. What was the resulting price increase per ounce of Candy Bar M?
A) 5%
B) 10%
C) 15%
D) 20%
E) 25%
- by Bens4vcobra
Tue Jul 05, 2011 6:05 am- Forum: Problem Solving
- Topic: Percents-Price Word Translation
- Replies: 1
- Views: 909
Percents/Algebra Word Translation
A collage admissions officer predicts 20% of students who are accepted will not attend college. According to this prediction, how many students should be accepted to achieve a planned enrollment of x students?
A) 1.05x
B) 1.1x
C) 1.2x
D) 1.25x
E) 1.8x
- by Bens4vcobra
Tue Jul 05, 2011 6:02 am- Forum: Problem Solving
- Topic: Percents/Algebra Word Translation
- Replies: 7
- Views: 1636
Sequence Problem
In the infinite sequence a1, a2, a3....aN.... each term after the first is equal to twice the previous term. If a5 - a2 = 12 what is a1?
A) 4
B) 24/7
C) 2
D) 12/7
E) 6/7
- by Bens4vcobra
Tue Jul 05, 2011 6:00 am- Forum: Problem Solving
- Topic: Sequence Problem
- Replies: 8
- Views: 1778
Standard Deviation
A certain list of 100 data has a mean of 6 and a standard deviation of d, where d is positive. Which of the following pairs of data, when added to the list, must result in a list of 102 data with a standard deviation of less than d?
A) -6 and 0
B) 0 and 0
C) 0 and 6
D) 0 and 12
E) 6 and 6
- by Bens4vcobra
Tue Jul 05, 2011 5:57 am- Forum: Problem Solving
- Topic: Standard Deviation
- Replies: 2
- Views: 1022
Studying for 7-8 hours a day seems extreme. If you are THAT weak in Quant (getting a 13) then you definitely don't need to cram. You need to move slowly. Take 1-2 days off per week. Study in short bursts of 1-3 hours (min/max) at a time. You are not allowing your brain to fully grasp the logic behin...
- by Bens4vcobra
Fri Jul 01, 2011 8:44 am- Forum: GMAT Strategy
- Topic: Distraught. My hard work didn't pay off for the GMAT.
- Replies: 5
- Views: 2035