Jo is loading a freight elevator with 30-pound identical boxes. Jo weighs 180 pounds and his dolly cart for wheeling the boxes on and off the elevator weighs 20 pounds. The elevator can carry no more than 2000 pounds. How many boxes can be loaded on the elevator?
180 pounds plus 20 pounds is 200 pounds, which means that the weight of the boxes can't be any more than 1800 pounds (2000 - 200 = 1800). Divide 1800 by 30 (weight of one box) and you'll get 60 boxes
