Question

in the scale used on a blueprint 1 4 inch represents 2 feet on the blueprint what is the length of a room with and actual of 20 feet

Answer 1

Set up a proportion.

0.5 / 4 = 2.8 / x

Cross multiply.

0.5x = 4 * 2.8
0.5x = 11.2
x = 22.4