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Word problem on rational expression

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Barn Painting

Problem: Melanie can paint a certain barn by herself in x days. Her helper Melissa can paint the same barn by herself in 2x days. Write a rational expression for the fraction of the barn that they complete in one day by working together. Evaluate the expression for x =5.

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Melanie can paint barn in X days, this implies that Melanie paints 1/Xth part of barn each day.
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