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In the modern era, the global population of humans has increased by 1

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Bunuel
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In the modern era, the global population of humans has increased by 1 [#permalink] New post   30 May 2018, 23:14
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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
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Tulkin987
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Re: In the modern era, the global population of humans has increased by 1 [#permalink] New post   30 May 2018, 23:18
Bunuel 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


Rate \(= 1\) billion every \(13\) years.

It would take \(7*13=91\) years for the Earth's population to double from \(7\) billion to \(14\) billion.

Answer: C
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Re: In the modern era, the global population of humans has increased by 1 [#permalink] New post   30 May 2018, 23:26
Bunuel 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


Answer: Current Population =7 Billion
To double this number, we need additional 7 Billion people
=> since it take 13 years to add 1 billion people
=> for additional 7 billion people, we need 13*7= 91 years.
C is the answer
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Re: In the modern era, the global population of humans has increased by 1 [#permalink] New post   01 Jun 2018, 11:24
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Bunuel 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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gmatclubot
Re: In the modern era, the global population of humans has increased by 1 [#permalink]
01 Jun 2018, 11:24
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