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OpenStudy (anonymous):
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OpenStudy (anonymous):
OpenStudy (dumbcow):
The rate that Jack works is 1yard/3 hrs The rate that Marylin works is 1yard/7 hrs If they work together, you add their rates 1/3 + 1/7 = 7/21 + 3/21 = 10/21 So together they can mow 10 yards in 21 hours or 1 yard in 2.1 hours
OpenStudy (anonymous):
THX
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