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

If ratios aren't a strong thing for you, make it into a fraction and compare it that way.

4/7 = _/21

21 divided by 7 = 3

So, 3 times 4 = _

Answer 2

Hi!

4:7
x:21

21/7 = 3
4 · 3 = 12

4:7
12:21

There are 12 boys at the movie.

Hope this helps! :)