Question

On a scale drawing, 1 milliliters is 5 meters. If a line on the drawing is 4.5 centimeters, how many is it actually?

Answer 1

$\frac{1mm}{5m} = \frac{4.5cm}{x}$

Convert cm to mm.

$\frac{1mm}{5m} = \frac{45mm}{x}$

Solve for x:

$x=\frac{5m}{1mm} \times 45mm$
$x=\frac{225m \times mm}{1mm} = 225m$