Suppose the amount of chickens varies directly with the pounds of corn needed. Billy
Bob feeds 30 chickens with 5 pounds of corn. Billy Bob is planning to buy 15 more
chickens and is wondering how much corn he will need to buy to feed all his chickens.
Assuming the new chickens are the same size and will eat the same portions of corn,
how much corn will Billy Bob need to purchase to feed all 45 chickens?