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

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Founder
Joined: 18 Apr 2015
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Kudos [?]: 1710 [0], given: 7485

In a certain country, a person is born every 3 seconds and a [#permalink]  04 Sep 2019, 09:08
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Question Stats:

80% (00:50) correct 20% (00:00) wrong based on 5 sessions
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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Intern
Joined: 28 Aug 2019
Posts: 36
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Kudos [?]: 7 [1] , given: 6

Re: In a certain country, a person is born every 3 seconds and a [#permalink]  06 Sep 2019, 02:02
1
KUDOS
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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