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In the modern era, the global population of humans has

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GMAT Club Legend
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GRE 1: Q167 V156
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In the modern era, the global population of humans has [#permalink] New post 27 May 2018, 04:01
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Question Stats:

75% (00:32) correct 25% (00:00) wrong based on 8 sessions
In the modern era, the global population of humans has increased by 1 billion people approximately every 13 years. If that rate were to continue, approximately how many years would it take for the Earth’s population to double from its current population of 7 billion people?

(A) 26
(B) 52
(C) 91
(D) 104
(E) 169
[Reveal] Spoiler: OA

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Re: In the modern era, the global population of humans has [#permalink] New post 27 May 2018, 04:17
C
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Re: In the modern era, the global population of humans has [#permalink] New post 27 May 2018, 11:59
Good one! Thanks.
GMAT Club Legend
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Joined: 07 Jun 2014
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Re: In the modern era, the global population of humans has [#permalink] New post 27 May 2018, 13:22
Expert's post
Explanation

To double from the current population of 7 billion people, the population would need to increase by 7 billion.

If the population increases by 1 billion every 13 years, an increase of 7 billion would take 7 × 13 = 91 years.

Hence option C is correct!
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Re: In the modern era, the global population of humans has [#permalink] New post 01 Jun 2018, 09:29
Expert's post
sandy wrote:
In the modern era, the global population of humans has increased by 1 billion people approximately every 13 years. If that rate were to continue, approximately how many years would it take for the Earth’s population to double from its current population of 7 billion people?

(A) 26
(B) 52
(C) 91
(D) 104
(E) 169


It will take 7 x 13 = 91 years for the population to double from 7 billion to 14 billion people.

Answer: C
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Re: In the modern era, the global population of humans has   [#permalink] 01 Jun 2018, 09:29
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