Question 1112084
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If 25% of the oil remains, then you have used 75% of the oil.
Since 75% is 3 times as much as 25%, the amount remaining is 1/3 of the amount you have used.
1/3 of 25 quarts is 25/3 quarts, or 8 1/3 quarts.<br>
ANSWER: 8 1/3 quarts.