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

Answer:

12 boys

Step-by-step explanation:

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

$\frac{4}{7}=\frac{x}{21}$

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

Answer:

12 boys

Step-by-step explanation:

Use the ratio

7(3)= 21

4(3)= 12