The population of a city increased by 15% in a year. If the present population is 20700,find the population a year ago

Given: The population of a city increased by $15$ % in a year. If the present population is $20700$.

To do: To find the population a year ago.

Solution:

Let us take the population one year ago be $x$.

Then, the population after one year $=\frac{115x}{100}=20700$

$\Rightarrow \frac{115x}{100}=20700$

$\Rightarrow x=20700\times\frac{100}{115}$

$\Rightarrow x=18000$

Therefore the population one year was $18000$.

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Updated on: 10-Oct-2022

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