Holly has watched 39% of a movie that is 122 minutes long. Which is the best estimate for the number of minutes of the movie that Holly has watched?

Estimate 39% as 40%. Then 40% of 122 minutes is 0.4 × 122 = 48.8 minutes, which is closest to 48 minutes. The exact amount, 0.39 × 122 = 47.58 minutes, also rounds to about 48 minutes.

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