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A plumber needs four lengths of pipe, each 3 feet, 6 inches long. Pipes are sold by foot. How many feet does he need to buy?
14
15
16
12
Detailed Explanation
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.
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