If Henry were to add 7 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:	A) 25	B) 40	C) 64	D) 80	E) 56

Rationale: "7 / 8 x - 3 / 4 x = 7 galls 1 / 8 * x = 7 gallons x = 56 gallons answer e"
Answer: E