Question

A class has 60 girls. The ratio of number of boys to that of girls is 3:2. What is the percentage of boys in the class?

• A. 20
• B. 30
• C. 40
• D. 50

Answer 1

The correct option is D

50

Given: The ratio of number of boys to that of girls = 3:2

For finding the percentage of boys in the class, we do not need to calculate the total number of students or the number of boys.

Let, number of boys be $3x$ and number of girls be $2x$ (since the ratio of number of boys to that of girls is 3:2)

Total students = $3x+2x$ = $5x$

$\therefore$ The percentage of boys = $\frac{3x}{5x}\times 100$ = 60%