abrandon6561 abrandon6561

17-12-2018
Mathematics

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You can paint a building in 9 hours. Your friend can paint the same building in 12 hours. How long will it take the two of you working together to paint the building?

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jllandivarscott jllandivarscott

17-12-2018

12+9=21. 21/2=10.5hours

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