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 $22.30. The oil change for the
other car required 7 quarts of oil and cost $25.80. How much is the labor fee and how much is each quart
of oil?

Answer 1

Each quart of oil is 4 dollars and the labor fee is 2 dollars.