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
Question 987544: 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? Round your answer to 1 decimal place.
Start by identifying the given data.
Christopher can paint the interior of his house in 15 hours. Therefore, he can paint 1/15 of his house per hour.
Christopher and Cynthia can do the same job together in 9 hours. Therefore, they can paint 1/9 of the house per hour. Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
PAINTERS RATE as JOB per HOUR
Christopher
Cynthia
Christopher&Cynthia
The rate for Christopher and Cynthia working together is the sum of their individual rates.