The function $f(x)$ satisfies
\[xf(y) = yf(x)\]for all real numbers $x$ and $y.$  If $f(15) = 20,$ find $f(3).$
Question:
The function $f(x)$ satisfies
\[xf(y) = yf(x)\]for all real numbers $x$ and $y.$  If $f(15) = 20,$ find $f(3).$
Answer:
Let's think step by step.

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4
The function $f(x)$ satisfies
\[xf(y) = yf(x)\]for all real numbers $x$ and $y.$  If $f(15) = 20,$ find $f(3).$
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