If Henry were to add 9 gallons of water to a tank that is already 3/4 full of water, the tank would be 7/8 full. How many gallons of water would the tank hold if it were full?	Select the correct option:
A) 25
B) 40
C) 64
D) 72
E) 96
7/8x-3/4x=9galls   1/8*x=9gallons   x=72 gallons   Answer 72
<result>D</result>
If Henry were to add 9 gallons of water to a tank that is already 3/4 full of water, the tank would be 7/8 full. How many gallons of water would the tank hold if it were full?