SOLUTION: Christopher can paint the interior of his house in 15 hours. If he hires Cynthia to help him, they can do the same job together in 9 hours. If he lets Cynthia work alone, how long
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-> SOLUTION: Christopher can paint the interior of his house in 15 hours. If he hires Cynthia to help him, they can do the same job together in 9 hours. If he lets Cynthia work alone, how long
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Question 639084: Christopher can paint the interior of his house in 15 hours. If he hires Cynthia to help him, they can do the same job together in 9 hours. If he lets Cynthia work alone, how long will it take her to paint the interior of his house? Answer by graphmatics(170) (Show Source):
You can put this solution on YOUR website! Let t be the number of hours Cynthia needs to paint the house. Then in 1 hour:
So Cynthia needs 22.5 hrs to paint the house.
