Question

The ratio of boys to girls in a gym class is 5:3. There are 27 girls in the class. How many boys are in the class?

Answer 1

There are 45 boys in the gym class.

Explanation:

Set up an equation:

Variable x = number of boys in the class

5/3 = x/27

Cross multiply:

5 × 27 = 3 × x

135 = 3x

Divide both sides by 3

45 = x

Check your work:

5/3 = 45/27

5 × 27 = 3 × 45

135 = 135

Correct!