leiang398 leiang398

31-10-2017
Mathematics

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Over the course of a year,a tractor-trailer commutes 160,000 miles across America.Assuming a trucker changes his tires every 40,000 miles,and that he starts with a brand new set of tires,how many sets of tires will he use in a year?

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31-10-2017

160,000 - 40,000= 120,000/4 = 3 sets of new tires in the first year and 4 every consecutive year.

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