Source: GMAT Prep
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
The OA is D
If in a certain population, people are born at an average rate of 9 people every 2 seconds and people die at...
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Solution:BTGmoderatorLU wrote: ↑Fri Sep 04, 2020 9:57 amSource: GMAT Prep
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
The OA is D
The growth rate, i.e., the difference between the number of people born and those who have died, per second, is:
9/2 - 3/2 = 4.5 - 1.5 = 3
So the growth rate is 3 x 3600 x 24 = 259,200 per day.
Answer: D
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