Question

The ratio of boys to girls in a class is $5$ to $6$. If there are $30$ girls in the class, how many boys are there?

Answer 1

Given the ratio of boys to girls in a class is $5:6$.

Let the number of boys and girls in the class be $5x$ and $6x$.

Also given there are $30$ girls in the class.

Then according to the problem,

$6x=30$

or, $x=5$.

Then the number of boys in the class is $5\times 5=25$.