SOLUTION: The tires on Mary's car will have to be replaced when they each have 140 000 km of wear on them. If new tires cost $100.00 each, what is the total cost of the wear on Mary's tires
Question 1173765: The tires on Mary's car will have to be replaced when they each have 140 000 km of wear on them. If new tires cost $100.00 each, what is the total cost of the wear on Mary's tires for a year in which she drives 21 000 km? Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website! .
Use this proportion
= ,
where x is the unknown value under the problem's question.
This proportion says that the miles per dollar are the same in both cases.
From the proportion, find
x = = 15 dollars. ANSWER