As part of your job as a quality-control inspector in a factory you can check 16 parts in 3 minutes. How long will it take you to check 80 parts?

Checking 80 parts means checking 5 times as many parts as 16, since 80 ÷ 16 = 5. At the same rate, the time is also multiplied by 5: 3 × 5 = 15 minutes. The correct choice is 15 minutes.

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