14:21 = 2:n
You asked:
Solve \(14 : 21=2 : n\) for the variable \(n\).
MathBot Answer:
$$\begin{aligned}n &= 3\end{aligned}$$
Express both ratios as fractions. \[\frac{14}{21} = \frac{2}{n}\]
Cross-multiply and solve for the unknown. $$\begin{aligned}\frac{14}{21} &= \frac{2}{n} \\ 14 n &= 42 \\ n &&= 3 \end{aligned}$$