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In a certain country, a person is born every 3 seconds and a

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In a certain country, a person is born every 3 seconds and a [#permalink] New post 04 Sep 2019, 09:08
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In a certain country, a person is born every 3 seconds and a person dies every 10 seconds. Therefore, the birth and death rates account for a population growth rate of one person every

A. \(3 \frac{1}{3}\) sec

B. \(4 \frac{2}{7}\) sec

C. \(7\) sec

D. \(11 \frac{2}{3}\) sec

E. \(13\) sec
[Reveal] Spoiler: OA

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Re: In a certain country, a person is born every 3 seconds and a [#permalink] New post 06 Sep 2019, 02:02
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A person is born every 3 seconds
So for a seconds, 1/3
A person dies every 10 seconds
So for a seconds, 1/10
population growth rate is 1/3 - 1/7 = 7/30 per second

but what question ask for is per person so ans is 30/7
Re: In a certain country, a person is born every 3 seconds and a   [#permalink] 06 Sep 2019, 02:02
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In a certain country, a person is born every 3 seconds and a

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