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Mathematics, 15.07.2019 10:30 idontknow1993

When andrew and moe worked together last year, they painted a fence in 6 hours. the previous year, moe painted the fence by himself. the year before that, andrew painted by herself, but it took 9 hours longer. how long did it take andree to paint the fence? a. 9 hoursb. 6 hoursc. 18 hoursd. 12 hours

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