A 18 gallon salt water solution contains 15% pure salt. How much water should be added to produce the solution to 12% salt?
This is what I tried:
18 * 0.85 = 15.3, the amount of water in the solution, so:
15.3 / 18 = 85 / 100 -> The amount of water in the solution equals 85% (100-15 pure salt)
x / 18 = 88 / 100 (88% is the amount of water required to have 12% salt in the water. 100 - 12 = 88)
x = 15.84, so the amount of water needed to be added is 0.54
However, that is not the correct answer, the correct answer is 4.5
FORGOT TO MENTION: The water is measured in gallons, if it helps anyone.
This is what I tried:
18 * 0.85 = 15.3, the amount of water in the solution, so:
15.3 / 18 = 85 / 100 -> The amount of water in the solution equals 85% (100-15 pure salt)
x / 18 = 88 / 100 (88% is the amount of water required to have 12% salt in the water. 100 - 12 = 88)
x = 15.84, so the amount of water needed to be added is 0.54
However, that is not the correct answer, the correct answer is 4.5
FORGOT TO MENTION: The water is measured in gallons, if it helps anyone.