Answer :
One way to solve is to set up a proportion. If the ratio of comedies to action is 4:3 (also can be written as the fraction 4/3) then you can set 4/3 equal to 20/x.
4/3 = 20/x
then cross multiply.
4·x = 3·20
4x = 60 Then divide both sides by 4
x= 15
4/3 = 20/x
then cross multiply.
4·x = 3·20
4x = 60 Then divide both sides by 4
x= 15