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One person can do a certain job in six days, a second person can do the same job in two days, and a third person can do this job in three days. How many days will they take to do the job together?

 Aug 18, 2020
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1  / (1/6 + 1/2 + 1/3) = days for all three = .....day(s)

 Aug 18, 2020

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