We are given:
3 inches represent 20 feet
Number of inches that represent 12 feet:
Number of inches that represent 1 feet:
We are given the ratio 3 inches:20 feet
dividing both the values by 20
(3/20) inches : 1 feet
Number of inches that represent 12 feet:
We solved for the relation:
(3/20) inches : 1 feet
Multiplying both the values by 12:
(3*12/20) inches : 12 feet
1.8 inches : 12 feet
Hence, 1.8 inches on the map represent 12 feet
