Question

For art class you have constructed a model of your family's car. If your model is 4 inches high and your car is five feet hight. What scale factor did you use
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Answer 1

Based on the problem statement, you can write the scale factor as

... 4 in : 5 ft

However, we suspect you are to convert this to the ratio of pure numbers (without units). We know 5 ft = 60 in, so this could be ...

... 4 in : 60 in, or

... 4:60, or

... 1:15.

The latter ratio is obtained by removing a factor of 4 from 4 and 60.