Let $x$ and $y$ be positive real numbers such that $4x + 9y = 60.$  Find the maximum value of $xy.$
Question:
Let $x$ and $y$ be positive real numbers such that $4x + 9y = 60.$  Find the maximum value of $xy.$
Answer:
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Let $x$ and $y$ be positive real numbers such that $4x + 9y = 60.$  Find the maximum value of $xy.$
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