Four workers, P, Q, R, and S, can complete a job in 5, 10, 15, and 20 days respectively. How many days will it take for all four to complete the job together?
Four workers, P, Q, R, and S, can complete a job in…
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Four workers, P, Q, R, and S, can complete a job in 5, 10, 15, and 20 days respectively. How many days will it take for all four to complete the job together?
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