Question

If $70\%$ of the students in a school are boys and the number of girls is $540$, find the number of boys in the school

Answer 1

Consider that the total number of students is $x$.

The number of girls is given as $540,$ then the number of boys will be $x-540$.

Since $70\%$ of the students are boys, then the remaining $30\%$ are girls.

So,

$30\%$ of $x=540$

$\Rightarrow \frac{30x}{100}=540$

$\Rightarrow x=\frac{540\times 100}{30}$

$\therefore x=1800$

Therefore, the total number of students is $1800$.

Thus, the total number of boys is $1800-540=1260$.