Bunuel wrote:
There are 4 quarts in a gallon. A gallon of motor oil sells for $12 and a quart of the same oil sells for $5. The owner of a rental agency has 6 machines and each machine needs 5 quarts of oil. What is the minimum amount of money she must spend to purchase enough oil?
(A) $84
(B) $94
(C) $96
(D) $102
(E) $150
4 quarts make a gallon.
1 gallon of motor oil costs $12, which means 4 quarts (in the gallon) cost $12. This implies, if bought in a gallon quantity, one quart of oil will cost $3. Therefore,
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