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31-08-2018
Mathematics

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Christopher can paint the interior of his house in 35 hours. if he hires cynthia to help him, they can do the same job together in 25 hours. if he lets cynthia work alone, how long will it take her to paint the interior of his house? round you answer to 1 decimal place.

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JiakSai JiakSai

31-08-2018

Christopher = 35 hours

Christopher and Cynthia = 25 hours

1/25 - 1/35 = 2/175

175/2 = 87.5 hours <==== Cynthia needs 87.5 hours to paint the house alone.

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