Question

a blueprint for a house has a scale factor of 1 inch 3 ft. a wall in the blueprint is 5 in what is the length of the actual wall in feet

Answer 1

15 ft

Explanation

you can easily solve this by using a rule of three

Step 1

Let x represents the actual length of the wall in feet

is

$1\text{ inc}\rightarrow3\text{ ft}$

then

$5\text{ in}\rightarrow x$

as the proportion is the same

$\begin{gathered} \frac{1}{3}=\frac{5}{x} \\ \text{cross multiply} \\ x\cdot1=5\cdot3 \\ x=15\text{ ft} \end{gathered}$

so, the answer is 15 ft

I hope this helps you