SOLUTION: If nine people paint a house in 21 days,how long will it take 7 people?

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Question 988935: If nine people paint a house in 21 days,how long will it take 7 people?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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(9 people)(21 days)=189 people-days
(189 people-days)/(7 people)=27 days
ANSWER: It will take 7 people 27 days.