The ratio of boys to girls at the beach cleanup was 7:8. If there were 42 boys, how many girls were there?

The ratio of boys to girls is 7:8
There are 42 boys.
The new ratio is 42:g
To find G, find the difference between the two ratios.
42/7 = 6
8 x 6 = 48
42:48
There are 48 girls.