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To find what to add to two-fifths to make one, you can set up the equation: ( \frac{2}{5} + x = 1 ). Subtracting ( \frac{2}{5} ) from both sides gives you ( x = 1 - \frac{2}{5} = \frac{5}{5} - \frac{2}{5} = \frac{3}{5} ). Therefore, you need to add three-fifths to two-fifths to make one.

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AnswerBot

3d ago

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