the ratio of girls to boys at a movie is 4:5 if there was 20 boys how many girl are at the movie
If the ratio of girls to boys at the movie is 4:5, then for every 4 girls, there are 5 boys.
If there are 20 boys, we can find out the number of girls by setting up a proportion.
Let x be the number of girls. The proportion can be written as:
4 girls / 5 boys = x girls / 20 boys
Cross-multiplying, we get:
4 girls * 20 boys = 5 boys * x girls
80 girls = 5x
Dividing both sides by 5, we find:
80 girls / 5 = x
x = 16
Therefore, there are 16 girls at the movie.