Answer:
Find number of cans that 15 large and small boxes can hold respectively.
1 large box = 12 cans
15 large boxes = 12 × 15 = 180 cans
1 small box = 4 cans
15 small boxes = 4 × 15 = 60 cans
Question wants to find how many more cans can 15 large boxes hold than 15 small boxes.
Find the difference between the number of cans in 15 large boxes and 15 small boxes.
Difference = 180 - 60 = 120 cans
Hence, 15 large boxes will hold 120 more cans than 15 small boxes.