Math CentralQuandaries & Queries


Question from Michael:

A plumber cuts three sections of pipe from a 12’ length of ABS pipe, the lengths of the sections are 33 3/8”, 56 5/8” and 39 7/8”. What is left over from the full length, if the saw cut is 1/8” wide?

HI Michael,

I first added the lengths of the three sections to make sure the 12' = 144" is long enough to allow you to cut the pieces you need. There is some wastage however, you waste 1/8" for each cut. How many cuts do you need? Add 1/8" for each cut to the sum of the lengths of the three pieces. How much of the 144' is left?


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