This is a question on proportionality, but is best presented with the unknown quantity being the final term in the expression.
If 20' is proportional to 1" then 8' is proportional to how many inches?
20/8 = 1/n : n = 8/20 = 2/5 or 0.4 inch
NOTE : Like measurements, in this case feet and inches, are set out on opposite sides of the equation to enable the answer to be obtained.
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21.5/20 = 1.075 inches.
one twelfth feet is in one inch because 12 inches equals a foot.
1 inch = 1/12 foot 35.433 inches = (35.433 / 12) = 2.95275 feet (exact ! How did that happen ?)
1 inch equals 2.54 cm. 1250 cm = 1250/2.54 inch = 492.126 inches or approximately 41 feet .
6 feet = 72 inches