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Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Let $x$ and $y$ be positive integers such that $\frac{1}{x}+\frac{1}{y}=\frac{1}{20}$ . What is the maximum possible value of $y$ ?

(A) $40$ (B) $60$ (C) $240$ (D) $420$ (E) $480$

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