Find the number of miles between the cities

Question

on a certain map, 1 inch represents 15 miles. If two cities are 7 inches apart on the map, find the number of miles between the cities.

Answer 1

If 1 in. = 15 mi.  (which can be expressed as the ratio 1:15 )

 

then 7 * 1 = 7 in. = 7 * 15 = 105 mi. , the distance between the two cities