Solve This Proportion Y/23= -3/4

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

Can someone me and do the problem plz so i can understand it more better

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.