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If 3 men or 6 boy, can do a piece of wor...

If 3 men or 6 boy, can do a piece of work in 10 days, working 7 hours a day; how many days will it take to complete a piece of work twice as large with 6 men and 2 boy. Working together for 8 hours a day? `6` b. `9` c. `8 1/2` d. `7 1/2`

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