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

Answer:

He will use 4 sets of tires in a year.

Step-by-step explanation:

This question can be solved by a rule of three.

We have that:

Each set of tires lasts 40,000 miles. How many sets are going to be needed for 160,000 miles. So:

1 set - 40,000 miles

x sets - 160,000 miles

$40000x = 160000$

$x = \frac{160000}{40000}$

$x = 4$

He will use 4 sets of tires in a year.

Answer 2

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