MATH HELP PLZ!!!
A rug cleaning company sells three models. EZ model weighs 10 pounds, packed in a 10-cubic-foot box. Mini model weighs 20 pounds, packed in an 8-cubic-foot box. Hefty model weighs 60 pounds, packed in a 28-cubic-foot box. A delivery van has 284 cubic feet of space and can hold a maximum of 440 pounds. To be fully loaded, how many of each should it carry if the driver wants the maximum number of Hefty models?