Question

Jack is making a scale drawing of his house. He has decided to use a scale of 1 in.: 100 m. If a part of his house is 20 m long, what will be the length of this part on his scale drawing?

Answer 1

we can use cross-multiplication

$\begin{gathered} 1\longrightarrow100 \\ x\longrightarrow20 \end{gathered}$

where x is the measure we need

$\begin{gathered} x=\frac{20\times1}{100} \\ x=0.2 \end{gathered}$

so, the measure is 0.2 in