Question

Kevin moved from a city to a small town. The population of the city is 8*10^4 is about 20 times as great as the small town. What is the approximate population of the small town?

Answer 1

Given:

Population of city = $8\times 10^4$

It is about 20 times as great as the small town.

To find:

The approximate population of the small town.

Solution:

Population of city is about 20 times as great as the small town. It means,

$\text{Population of city}=20\times \text{Population of small town}$

$\dfrac{\text{Population of city}}{20}=\text{Population of small town}$

On substituting Population of city = $8\times 10^4$, we get

$\text{Population of small town}=\dfrac{8\times 10^4}{20}$

$\text{Population of small town}=\dfrac{8\times 10\times 10^3}{20}$

$\text{Population of small town}=4\times 10^3$

Therefore, the population of the small town is $4\times 10^3$.