Question

In a class of 50 students, the ratio of number girls to boys is 3:2. How many more boys needs to be added to the class as to make the ratio 1:1?

• A. 10
• B. 5
• C. 15
• D. 20

Answer 1

The correct option is A

10

With the given information, we can construct an equation

3x+2x = 50, where x is a ratio constant.

5x = 50

which gives x = 10. Hence we can get the initial number of girls and boys at 30 and 20 respectively.

If the ratio needs to be 1:1, it implies the number of girls is equal to the number of boys. So the number of boys that should be added is 10.