A 80 gallon solution of salt and water is 10% salt. How many gallons of water must be added to the solution in order to decrease the salt to 8% of the volume?  Choose the correct choice from the following answers:
A) 20  B) 12  C) 13  D) 14  E) 16

Rationale: "amount of salt = 8.0 assume x gallons of water are added . 8.0 / 80 + x = 8 / 100 800 = 8 x + 640 8 x = 160 x = 20 correct option : a"
Answer: A