Jordan has a jar of quarters. When he has 60 quarters in the jar, the jar weighs 52 ounces. When there are 125 quarters in the jar, the jar weighs 65 ounces. What is the weight of the empty jar?

The 65 additional quarters increase the jar’s weight by 13 ounces, so each quarter weighs 13 ÷ 65 = 0.2 ounce. With 60 quarters, the quarters weigh 60 × 0.2 = 12 ounces, leaving 52 − 12 = 40 ounces for the empty jar. The correct choice is 40 ounces.

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