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If a certain number of workmen can do a ...

If a certain number of workmen can do a piece of work in 25 hours, in how many hours will another set of an equal number of men, do a piece of work, twice as great, supposing that 2 men of the first set can do as much work in an hour, as 3 men of the second set do in an hour? `60` b. `\ 75` c. `90` d. `105`

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