Suppose A and B are sets such that AuB has 20 elements, AnB has 7 elements, and the number of elements in B is twice that of A. what is the number of elements in A?

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

Triangle xyz has vertices x(1,3), y(0,0)

How do you find principle and simple interest