Question

There are 18 girls in a class and the ratio of the number of girls and boys in the class is 3:2. Find the number of boys.

Answer 1

Number of boys = 12

Explanation:

Let the total number of children in the class be x

Number of girls = 18

Number of boys = x - 18

Ratio of girls and boys = 3 : 2

Sum of the ratio = 5

Find the value of x

`(3)/(5 ) * x = 18\\\\3 * x = 18 * 5\\\\x = (90)/(3) = 30`

Therefore, total number of children in the class = 30

Hence number of boys = x - 18 = 30 - 18 = 12

Answer 2

12

Explanation:

Multiply to get the number of girls they've given you.

3 x 6 = 18 girls.

2 x 6 = 12 boys.