A plumber is fixing a pipe with an interior diameter of 0.63 inch. He buys a replacement piece that must fit inside the old pipe. He uses plumbing tape that will fill 0.15 inch of the space between the two pieces of pipe. The new pipe must be 0.1 inch smaller than the old pipe and tape, so that it can fit inside.
Part A: What is the largest interior diameter pipe he can but that will still fit inside the old pipe?
Part B: Explain how you found your answer.