What is the scale factor

Question

The actual Mount Rushmore carving was made from a scale with a scale of 1 in = 1 ft. On the model, Teddy Roosevelt's moustache was 1ft and 8in long

Answer 1

The scale of 1 inch to 1 foot equates to  1 inch to 12 inches or 1:12

 

The model moustache of 1ft 8in = 12+8 = 20 inches.

The monument moustache = 20 feet long

 

Note that this conforms to the scale.

20 ft = 20(12) = 240 inches long

 

20:240 = 1:12