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
Approach I - Remainder
I treated this as a remainder question.
She needs 30 quarts of oil:
6 machines * 5 quarts ea = 30 quarts
1 gallon = 4 quarts
Divide 30 by 4.
Because there are
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