SOLUTION: 8 person work crew completes a job in 18 hours. What is the fewest number of workers needed to do the same job in 7 hours?

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Question 623438: 8 person work crew completes a job in 18 hours. What is the fewest number of workers needed to do the same job in 7 hours?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
8 person work crew completes a job in 18 hours.
Find the number of man-hrs to complete the job:
8 * 18 = 144 man-hrs
:
What is the fewest number of workers needed to do the same job in 7 hours?
Let w = no. of workers required to do the job in 7 hrs
7w = 144
w = 144/7
w ~ 21 workers