A 40 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 option:
A) 810  B) 12  C) 13  D) 14  E) 16
Amount of salt = 4.0   Assume x gallons of water are added.   4.0 / 40 + x = 8/100   400 = 8x + 320   8x = 80   x = 10   Correct Option: 810
<result>A</result>
A 40 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?