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Two cars got an oil change at the same auto shop. The shop charges customers for each quart of oil
ense plus a flat fee for labor. The oil change for one car required 5 quarts of oil and cost $21.75. The oll
change for the other car required 7 quarts of oil and cost $24.75. How much is the labor fee and how
much is each quart of oil?
The labor fee is $
, and each quart of oil costs $