Question

A Plummer is fixing a pipe with an interior diameter of 0.63 inches. He buys a replacement pipe that must fit inside the old pipe. He uses plumbing tape that will fill 0.15 inches off the space between the two pieces of pipe. The new pipe must be 0.1 inches smaller than the old pipe and tape so that it can fit inside. What is the largest interior diameter pipe he can buy that will still fit inside the old pipe?

Answer 1

.63 - .15 - .10 = .38 is the answer.