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2014-07-28T16:25:00+05:30

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Work completion  requires  90 men and  8 hours/day during 24 days
                             W  =  90 men *  8 hr / day  * 24 day  = 90*8*24 man-hours
Men work for 18 days working 15/2 hours per day  :
   total number of hours  =  H =  18 days * 15/2 hrs/day = 9*15 hours
Men required =  W / H    =  90*8*24 / (9 * 15)  = 128
                       
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