Question

A model car is 3 in long. If it was built

with a scale of 1 in : 5 ft, then how long is
the real car?

Answer 1

15 feet

Explanation:

if you set up a proportion where the ratio of 1 inch equals 5 feet equals 3 inches over 'x' you can see that to get from 1 to 3 you must multiply numerator and denominator by 3; denominator of 5, multiplied by 3, gives you 15