A contract is to be completed in 46 days...

A contract is to be completed in 46 days and 117 men were set to work, each working 8 hours a day. After 33 days, `4/7` of the work is completed. How many additional men may be employed so that the work may be completed in time, each man now working 9 hours a day? `80` b. `82` c. `81` d. `83`

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