Question

On a city map, 2 inches represents 10 miles. The library and the bank are 5 inches apart on the map. What is the actual distance in miles between the library and the bank?

Answer 1

Direct proportionality
2 inches/ 10 miles = 5 inches / x miles
cross multiply
2x = 50
divide both sides by 2
x = 25
The actual distance between the library and the bank is 25 miles

Hope this helps :)