Question

A company that creates model cars uses a 1.5 foot:1 inch ratio when creating the models. If a real car is 12 feet long, how long will the model car be?

Answer 1

1.5 ft real = 1 inch in model
1 ft real = 1/1.5 inch in model
12 ft real = 12(1/1.5) or 8 inches in the model

or, if you have learned about ratios ...
1.5/12 = 1/x
1.5x = 12
x = 12/1.5= 8 , same as above