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12 men and 18 boys, working 7 1/2 , hour...

12 men and 18 boys, working `7 1/2` , hours a day, can do a piece of work in 60 day. If a man works equal to 2 boys, then how many boys will be required to help 21 men to do twice the work in 50 day, working 9 hours a day? `30` b. `42` c. `48` d. `90`

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