Question
$$\frac{n}{15} = \frac{6}{18}$$
Answer
$$ n = 5 $$
Explanation
$$ \begin{aligned} \frac{n}{15} &= \frac{6}{18}&& \text{multiply ALL terms by } \color{blue}{ 90 }. \\[1 em]90 \cdot \frac{n}{15} &= 90\cdot\frac{6}{18}&& \text{cancel out the denominators} \\[1 em]6n &= 30&& \text{ divide both sides by $ 6 $ } \\[1 em]n &= \frac{30}{6}&& \\[1 em]n &= 5&& \\[1 em] \end{aligned} $$
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