Sylvia set a treadmill for 38 minutes, and so far she has run 61% of the minutes. Which is the best estimate for the number of minutes Sylvia has run so far?

Estimate 61% as about 60%. Since 60% of 38 is 0.6 × 38 = 22.8, Sylvia has run about 23 minutes. The closest choice is 24 minutes.

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