Question

The ratio of boys to girls in a swimming lesson is 3:7. If there are 20 children in total, how many boys are there?

Answer 1

6

Explanation:

ratio is 3 parts boys to 7 parts girls = 10 parts total.

boys make up 3/10 of the total.

20 children.

so boys = (3/10) X 20 = 60/10 = 6.