Question 983941
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One man working one hour is 1 man-hour.
Two men working one hour is 2 man-hours.
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If 8 men can chop 9 cords of wood in 6 hours, how many hours will it take 4 men to chop 3 cords of wood?
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8 men working 6 hours is (8men) x (6 hrs)=48 man-hours
48 man hours/9 cords=5.33 man-hours/cord
It takes 5.33 man-hours to chop 1 cord of wood.
To chop 3 cords would take 3 cords x 5.33 man-hours/cord=16 man-hours.
It would take one man 16 hours to chop 3 cords.
For four men to provide 16 man-hours, they must work 4 hours 
(16 man-hours/4 men)=4 hours.
So it would take 4 men 4 hours to chop 3 cords.