Question

A blueprint shows a layout of a building. Every 5 inches in the blueprint represents 7 feet of the actual building. one of the walls on the blueprint measures 42 inches in length. what is the length of the actual wall

Answer 1

In this problem the ratio is 5 inches represent 7 feet, so if in the blueprint the wall is 42 inches the we can use a rule of 3 so:

`\begin{gathered} 5\to7 \\ 42\to x \end{gathered}`

and the equation is:

`\begin{gathered} x=(42\cdot7)/(5) \\ x=58.8 \end{gathered}`

So the wall is 58.8 feet