Question

Olga is trying to figure out the length of a pool at a hotel that is to be built. A one inch door in the model will become a 3 foot door in reality. If the length of the pool is 7 inches on the model, how long will it be when it is built?
21
10
23
13

Answer 1

So 1 inch = 3 feet.
So if you have 7 inches how many inches is that in respect to that ratio?

Answer 2

we know that for every 1 inch on the model
equals 3 feet in the actual build

3 feet = 3 * 12 = 36 inches

so \(\large {
\begin{array}{ccllll}
model&actual\ build
\\\hline\\
1&36\\
7&x
\end{array}\implies \cfrac{1}{7}=\cfrac{36}{x}\impliedby \textit{solve for "x"}
}\)