Joy is loading up a cargo truck with a shipment of small and large boxes. Each small box weighs 30
pounds, and each large box weighs 75 pounds. The truck can carry at most 1,500 pounds, and Joy
wants the shipment to have at least 40 boxes.
Which pairs (s, t) represent possible numbers of small and large boxes Joy could ship?
(48, 0)
(42, 3.2)
(55,-2)
(0, 20)