Question

The ratio of boys to girls in the class is 3 to 4. If there were 12 boys, how many girls were there?

Answer 1

16 girls

Explanation:

Set up a proportion. Let x = the number of girls.

3 / 4 = 12 / x

Cross multiply:

3x = 48

x = 16

Answer 2

Explanation:

let girls be x

3/4=12/x(do cross multiplication)

12*4=3x

48/3=x

16=x

therefore there are 16 girls