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If in a certain population, people are born at an average rate of 9 pe

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If in a certain population, people are born at an average rate of 9 pe [#permalink]

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New post 16 Apr 2017, 23:47
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  25% (medium)

Question Stats:

78% (01:24) correct 22% (01:23) wrong based on 74 sessions

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If in a certain population, people are born at an average rate of 9 people every 2 seconds and people die at an average rate of 3 people every 2 seconds, by approximately how many people does the population increase in 1 day?

A. 17,280
B. 25,920
C. 129,600
D. 259,200
E. 388,800

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Re: If in a certain population, people are born at an average rate of 9 pe [#permalink]

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New post 17 Apr 2017, 06:15
In every 2 seconds, 9 people are born and 3 die. Hence, about 6 are added.
A day has 24 hours or
(24×3600)/2 2 second intervals.
Total people added in a day are 259200(Option D)

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Re: If in a certain population, people are born at an average rate of 9 pe [#permalink]

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New post 17 Apr 2017, 06:29
Option D

Change in population every 2 seconds = 9 - 3 = +6.

Total change in 24 hours (24*60*60) = 24*60*60*3/2 =.....200
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Re: If in a certain population, people are born at an average rate of 9 pe   [#permalink] 17 Apr 2017, 06:29
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