Question

a scale model of a building uses 1 inch : 20 feet. if the actual height of the building is 60 feet, how tall is the model? ? inches

Explanation:

Step1: Set up proportion

Let $x$ be the height of the model. The proportion is $\frac{1\text{ inch}}{20\text{ feet}}=\frac{x\text{ inches}}{60\text{ feet}}$.

Step2: Cross - multiply

$20x = 1\times60$.

Step3: Solve for $x$

$x=\frac{60}{20}=3$.

Answer:

3