Dillon works in the shipping department of a toy factory that makes radio-controlled helicopters. Small helicopters weigh 3 pounds each, and are shipped in a container that
weighs 13 pounds. Large ones, on the other hand, weigh 4 pounds apiece, and are shipped in
a container that weighs 12 pounds. If these boxes can hold a certain number of helicopters
each, all of the packed containers will have the same shipping weight. What would the total
weight be? How many helicopters would fit in either container?