Question

4) A blueprint for a building has a scale of 1:40 (blueprint:actual). A wall in the blueprint is 4 inches tall. What is the height of the actual wall (in inches)?

*
40 inches
80 inches
1/160th of an inch
160 inches

Answer 1

160 inches

Explanation:

a scale of 1:40 means that any measurement in the blue print is multiplied by 40 to find the actual measurement

so 4*40= 160 inches

Answer 2

`\begin{array}{ccll} blueprint&actual\\ \cline{1-2} 1 & 40\\ 4& h \end{array} \implies \cfrac{1}{4}~~=~~\cfrac{40}{h} \implies h=160`