Need help with this problem

Question

On a map a half an inch represents 10 actual miles to towns that are 4 and 1/2 in apart on this map are how many actual miles apart

Answer 1

How many 1/2s are in 4 1/2?

4 1/2 = 9/2, so nine halves

9(10) = 90 miles

Or..

(1/2)/10 = (9/2)/m

Cross multiply.

(1/2)m = 45

m = 90 miles