Chapter 4.3, Problem 19P

A lot of gumballs are in a glass container. The container is shaped like a box with a square base. When you look down on the top of the container, you see about 50 gumballs at the surface. When you look at one side of the container, you see about 60 gumballs up against the glass. You also notice that there are about 9 gumballs against each vertical edge of the container. Given this information, estimate the total number of gumballs in the container. Explain your reasoning.