Here's Junior's BACKGROUND! I'm finished :)

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

Question and answers are in the attached picture. you so much in advance.

Im literally having a mental breakdown