16:20 = X:5
You asked:
Solve \(16 : 20=X : 5\) for the variable \(X\).
MathBot Answer:
$$\begin{aligned}X &= 4\end{aligned}$$
Express both ratios as fractions. \[\frac{16}{20} = \frac{X}{5}\]
Cross-multiply and solve for the unknown. $$\begin{aligned}\frac{16}{20} &= \frac{X}{5} \\ 80 &= 20 X \\ X &&= 4 \end{aligned}$$