Question

1 cm = 3 ft.

What would be the actual length of a wall that was 5 cm on the blueprint?

Answer 1

if 1 cm is 3 feet, then 5 cm would be 5 times what 1 cm is. In other words 5x3 feet

Answer 2

\(\large \begin{array}{ccllll}
cm&ft\\
\hline\\
1&3\\
5&x
\end{array} \bf \implies \cfrac{1}{5}=\cfrac{3}{x}\)