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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):
First person: 1/21 of job/minute Second person: 1/28 of job/minute x/21 + x/28 = 1 x = 12 minutes
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