Question

In a class of $40$ students, $25$ are girls and the remaining are boys. Find the ratio of girls to boys.

Answer 1

Total no. of students in class = $40$
Number of girls = $25$
Number of boys = $40-25=15$
The ratio of girls to boys = $\frac{25}{15}=\frac{5\times 5}{5\times 3}=\frac{5}{3}$
$5\mathrm{and}3$ have no common factor other than $1$.
So, the ratio of girls to boys is $5:3$.