A 6% alcohol salt solution is added to a 12% salt solution to produce a 3-liter 10% salt solution. How much of each solution was used? Show your solution.
sum of ingredients = ingredients in final soln
x = 6%
3-x = 12%
.06 x + .12 (3-x) = .10 (3) solve for 'x' the amount of liters of 6% then 12% amount = 3 - x liters