Since you've added the two mixture then, Let 'x' be the percentage of alcohol of the mixture 1li (0.10) + 3li (0.30) = 4li (x) 0.10 + 0.90 = 4x 1 = 4x 1/4 = x 0.25 = x or in percentage, x=25% ------- Therefore the resulting mixture is of 25% alcohol.
