Question

Two cars got an oil change at the same auto shop. The shop charges customers for each quart of oil plus a flat fee for labor. The oil change for one car required 5 quarts of oil and cost $24.35. The oil change for the other car required 7 quarts of oil and cost $28.35. How much is the labor fee and how much is each quart of oil?
The labor fee is $__and each quart of oil costs $___

Answer 1

First, you would need to find the oil costs without the labor fee. Easiest way to do this is to subtract 24.35 from 28.35, resulting in 4. 4/2 (subtract 5 from 7) gets you 2, so the oil costs $2 per quart. To get the labor, multiply 5 by 2 and subtract that value from 24.35, which gets you $14.35 for labor costs.