Question

The ratio of the length of a school ground to its width is $5:2$. Find its length, if the width is $40$ metres.

Answer 1

Given the ratio of the length of a school ground to its width is $5:2$.

Let the length and width be $5x$ and $2x$.

According to the problem $2x=40$

or, $x=20$.

Then length of the school ground is $5\times 20=100$ m.