Question

If a person is born every 5 seconds and a person dies every 12 seconds, then how many seconds does it take for the population to grow by one person? Please explain as well.

Answer 1

Solution:

As per the problem

A person is born every 5 seconds and a person dies every 12 seconds.

Here the LCD of 5 and 12 is 60.

The number of person born in 60 seconds$=\frac{60}{5}=12$

The Number of person died in 12 seconds$=\frac{60}{12}=5$

Hence Population increase in 60 seconds is$=12-5=7$

Hence time required to increase the population by one $=\frac{60}{7} \ \ seconds$