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Source: Official Guide for GMAT Review 2016 Problem Solving; #56

1

At the start of an experiment, a certain

At the start of an experiment, a certain population consisted of 3 animals. At the end of each month after the start of the experiment, the population size was double its size at the beginning of that month. Which of the following represents the population size at the end of 10 months?

1 Explanation

1

Jordan Song

At the beginning of the month the number is 3;
At the end of 1st month number is 3*2
At the end of 2nd month number is 3*2^2
hence at the end of 10th month =3*2^10
Hence answer is D

Apr 22, 2016 • Comment

Sam Kinsman

That's right; good job Jordan! The answer is 3(2^10)

Apr 23, 2016 • Reply

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Official Guide for GMAT Review 2016

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Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 5.3 Problem Solving

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