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11. Find the unit rate: A swimmer swam 648 laps in the pool during 9 days of practice. She swam during each practice session.

User Kevdliu
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In order to find the unit rate of number of laps per day, we divide the total number of laps by the number of days:

648/9 = 72

Therefore, the swimmer swam 72 laps per day in average.

User MatlabDoug
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