If Henry were to add 8 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?	Choose the correct choice from the following choices.
A) 25  B) 40  C) 64  D) 80  E) 96

Rationale: "7 / 8 x - 3 / 4 x = 8 galls 1 / 8 * x = 8 gallons x = 64 gallons answer c"
Answer: C