Question

The ratio of number of boys and girls in a class is 4 : 3. If there are 18 girls, find the number of boys and also the total number of students in the class.

Answer 1

Number of girls in the class = 18

Ratio of boys and girls = 4 : 3

According to the question,

$\frac{\text{Boys}}{\text{Girls}}=\frac{4}{5}$

$\frac{\text{Boys}}{18}=\frac{4}{5}$

$\text{Number of boys}=\frac{(4\times 18)}{3}=24$

So, there are 24 boys and 18 girls in the class.
Therefore, total number of students = 24 + 18 = 42.