Scale factor is 20
Step-by-step explanation:
First, we need to convert 5ft and 7.5ft into inches. 12 inches = one foot, so let’s multiply.
5 x 12 = 60 inches
7.5 x 12 = 90 inches
So the ratio of the width would be 3:60 while the length would be 4.5:90
If you simplify the ratio, you’ll get a scale factor of 20.