Question

The ratio of boys to girls at a movie is 4 : 7. If there are 21​ girls, how many boys are at the​ movie?

Answer 1

12 boys

Explanation:

let
`x` be the number of boys. You can set up an equation using equivalent ratios:

`(4)/(7)=(x)/(21)`

Cross-multiply to get:

`7x=84`

Divide both sides by 7 to get:

`x=12`

Thus, there are 12 boys at the movie.

Hope this helps :)

Answer 2

12 boys

Explanation:

Use the ratio

7(3)= 21

4(3)= 12