Answer:120 poundsStep-by-step explanation:To find the weight of 40 boxes, first find the weight of one box.Weight of 1 box = Total weight / Number of boxes= 45 pounds / 15 boxes= 3 pounds/boxNow, multiply by 40.Weight of 40 boxes = 3 pounds/box × 40 boxes= 120 poundsAnswer: 120 pounds.