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# In a renowned city, the average birth rate is 6 people every two secon

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Math Expert
Joined: 02 Sep 2009
Posts: 64213
In a renowned city, the average birth rate is 6 people every two secon  [#permalink]

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27 May 2016, 08:06
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Question Stats:

89% (01:29) correct 11% (01:21) wrong based on 19 sessions

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In a renowned city, the average birth rate is 6 people every two seconds and the death rate is 2 people every two seconds. Estimate the size of the population net increase that occurs in one day.

(A) 32,300
(B) 172,800
(C) 468,830
(D) 338,200
(E) 259,200

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Joined: 18 Jan 2010
Posts: 236
Re: In a renowned city, the average birth rate is 6 people every two secon  [#permalink]

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27 May 2016, 08:35
Bunuel wrote:
In a renowned city, the average birth rate is 6 people every two seconds and the death rate is 2 people every two seconds. Estimate the size of the population net increase that occurs in one day.

(A) 32,300
(B) 172,800
(C) 468,830
(D) 338,200
(E) 259,200

Every 2 seconds, 4 persons are added (6-2). Every second 2 persons are added.

In a day 24hrs = 24 * 60 Minutes = 24 * 60 * 60 = 86400 seconds.

86400 * 2 = 172800

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Re: In a renowned city, the average birth rate is 6 people every two secon  [#permalink]

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27 May 2016, 19:21
This question can be modified so that the birth rate is given every m seconds and the death rate is given every n seconds.

For this particular question : Increase in the population every 2 seconds = 6-2 = 4 people.

Total 2 second interval in a day = 24*60*60/2 = 43,200

Population increase = 43,200 * 4 = 172,800. Hence B.
Re: In a renowned city, the average birth rate is 6 people every two secon   [#permalink] 27 May 2016, 19:21