Kareem inserted 2 quarters into a dryer at a laundromat, and the dryer ran for 12 minutes. At this rate, for how long would the dryer have run if Kareem had inserted 8 quarters instead?

Two quarters run the dryer for 12 minutes, so each quarter adds 12 ÷ 2 = 6 minutes. With 8 quarters, the dryer would run for 8 × 6 = 48 minutes. The correct choice is 48 minutes.

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