Answer: An equation to represent the number of boys could be:
b = (15/8)g
Since the ratio of boys to girls is 5:3, we should divide 120 by 8 (the combined total) so we can determine the number of boys and girls.
120 / 8 = 15
For the boys, 5 x 15 = 75
For the girls, 3 x 15 = 45
There are 75 boys and 45 girls in the choir. Now, we have to write an equation.
g x k = b
45 x K = 75
K = 75/45 or 15/8
Our final equation will be b = (15/8)g
