Question

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?

Answer 1

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