Plz asap solid geometry word problems

Find the value of the variable and the length of each secant segment

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

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal