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Sammy can paint the house by himself in 15 hours. With Nolan's help, it only takes 9 hours.  How long would it take for Nolan to paint the house by himself?​

 Apr 9, 2020
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If it takes Sammy 15 hours to paint the house, that means that he paints 1/15 of the house per hour. If both Sammy and Nolan paint for 9 hours, then Sammy painted 9/15= 3/5 of the house. That means that Nolan painted 2/5 of the house in 9 hours. That means it takes Nolan 9 / 2 * 5= 22.5 hours.

 

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 Apr 9, 2020

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