Question

the legend on a map states that 1 cm is 15 km. if you measure 12 cm on the map, how many km would the actual distance be?

Explanation:

Step1: Set up proportion

Let $x$ be the actual distance. We have the proportion $\frac{1}{15}=\frac{12}{x}$.

Step2: Cross - multiply

$1\times x = 15\times12$.

Step3: Calculate result

$x = 180$.

Answer:

180