Rachel and her cousin Lena live in different cities about 100 miles apart.On the map the two cities measure 5 inches apart . What is the scale factor used for the map?
On her map 1 inch is equal to 20 miles.
5x=100
divide both sides by 5
x=20
5 is for the 5 inches.
x is for the unknown.
100 is the 100 miles between the cities.
So the scale 1:20