Question

A scale model of a car is 9 inches long. the scale is 1:18. How many inches long is the car it represents?

Answer 1

1 inch of the model - 18 inches of the car
9 inches of the model - x inches of the car

$\frac{1}{18}=\frac{9}{x} \\ x=9 \times 18 \\ x=162$

The car is 162 inches long.