Ryan has traveled 5/6 of the distance from Fraction Falls to Vertex Valley. He has 9 more miles to go. How many miles has Ryan traveled so far?

(5/6)D + 9 = D

9 = D - (5/6)D

9 = (1/6)D multiply both sides by 6

54 = total distance

He has traveled 54 - 9 = 45 miles