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OpenStudy (anonymous):
One person can do a certain job in twenty-one minutes, and another person can do the same job in twenty-eight minutes. How many minutes will it take them to do the job together? 6 min 12 min 24 min
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OpenStudy (anonymous):
@whpalmer4
OpenStudy (whpalmer4):
Find the rate at which each person works. Add the rates, find the time.
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