A scale distance of 3 centimeters on a map represents an actual distance of 51 feet.
How many centimeters on the map would represent a distance of 187 feet?
In this case, the best way to work this out is to find what 1cm is equal to. In this case, you have to divide 51/3, giving you 17. You know that 17 feet. You can now divide 187/17, giving you 11.
Therefore, 11cm is equal to 187 feet.
Hope this helps
