Use the four-step procedure to solve the following problem. how much water must be added to a gallon of 10% saline solution to create a 2% solution? 1. there is 1 gallon of 210% solution. 2. there is 02% saline in water. 3. the equation is (0.1)(1) + 0x = 0.02 x(0.1)(1) + 0x = 0.02 (x + 1). 4. the answer is 43 gallons.