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

Given, Number of girls in the class = 18

Given, Ratio of boys and girls = 4 : 3

According to the question,

$\Rightarrow \frac{\mathrm{Boys} }{\mathrm{Girls}}=\frac{ 4}{3}$

$\Rightarrow \frac{\mathrm{Boys} }{18}=\frac{ 4}{3}$

$\Rightarrow \mathrm{Boys} =\frac{4 \times 18}{3} = 24$

So, the total number of boys = 24

Therefore, the total number of students = 24 + 18 = 42.