Question
$$\frac{n}{12} = \frac{25}{60}$$
Answer
$$ n = 5 $$
Explanation
$$ \begin{aligned} \frac{n}{12} &= \frac{25}{60}&& \text{multiply ALL terms by } \color{blue}{ 60 }. \\[1 em]60 \cdot \frac{n}{12} &= 60\cdot\frac{25}{60}&& \text{cancel out the denominators} \\[1 em]5n &= 25&& \text{ divide both sides by $ 5 $ } \\[1 em]n &= \frac{25}{5}&& \\[1 em]n &= 5&& \\[1 em] \end{aligned} $$
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