Math CentralQuandaries & Queries


Question from Rich, a student:

Helen bought a new car with four tires and a full-size spare. If she rotated the tires so that each tire would have the same amount of wear, then how many miles were on each tire when her odometer showed 40,000 miles?

Hi Rich,

Think about one specific tire. Over the 40,000 miles, what proportion of the time is that tire in the trunk? How much wear is on the other 4 tires?


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