SOLUTION: If it takes 5 people 7 hours to clean an office building, how long would it take 4 people to clean the same building.

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Question 143620: If it takes 5 people 7 hours to clean an office building, how long would it take 4 people to clean the same building.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
it takes 35 (5*7) people-hours to clean the building

35 hours for 1 person, 1 hour for 35 people

for 4 people, 35/4 = 8.75 hours