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UKMT Maclaurin Olympiad, 2022

Algebra Difficulty 3.0 AMC 10/12 Prove it United Kingdom

A fruit has a water content by weight of $m\%$ . When left to dry in the sun, it loses $(m-5)\%$ of this water, leaving it with a water content by weight of $50\%$ . What is the value of $m$ ?

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