Help please if you can.

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

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76