Andrew is looking at a map that uses the scale 1 inch = 5 miles. on the map the distance from Westville to Allentown is 9 inches which proportion cannot be used to find the actual distance

Question

A. 1in/5mi = 9in/d

B. 5mi/d = 9in/1in

C. d/9in = 5mi/1in

D. 5mi/1in = d/9in

Answer 1

All but B gives d=45 miles which is correct.

Just cross multiply. For A (5)(9)=45 = d For B 9d=5 or d=5.9 which is incorrect

For C d=9(5)=45 For D d=5(9)=45 45 miles is the correct distance