If 3 kids share 2 1/2 pizza pies and 6 kids share 4 1/2 pies. In which group did the individual kids get more pizza?

Can someone show me the steps to solve the problem?

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

For what value of (y) is 3^3/3^y =1/9