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A plumber needs four lengths of pipe, each 3-feet, 6-inches long. Pipes are sold by the foot. How many feet does he need to buy?

A 14

Convert the pipe length to inches: 3 feet, 6 inches = 42 inches. Multiply 42 inches by the number of pipes needed to find the number of inches of pipe needed: 42 × 4 = 168. Divide the total amount of pipe needed in inches by 12 to determine how many feet of pipes are needed: 168 ÷ 12 = 14.