A blueprint shows 1" = 10. If the width of a closet on the blueprint is 0.5", then the width of the closet in real life is

A. 5'

B. 12'

C. 3'

D. 4'

E. 8'

I'm assuming the blueprint shows 1 inch is equal to 10 ft. This means that 1 inch on the blueprint corresponds to 10 feet in real life.

We have the ratio

1 inch: 10 feet

If we multiply both sides by 0.5 then,

0.5 * (1 inch) : 0.5 * (10 ft)

0.5 inch : 5 feet

So 0.5 inches (aka half an inch) on the blueprint corresponds to 5 feet in real life.

Answer: A) 5 feet