SOLUTION: How many liters of a 12% acid solution and a 20% acid solution should be mixed in order to get 4 liters of a 15% acid solution? my answer was 1 liter of 12% with 4 liters of 20%

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Hi,

Let x represent the higher concentrated solution of 20%    

.20x + .12(4L - x) = .15(4L)

                 x = .03(4L)/.08 = 1.5L of 20%  and 2.5L of 12%