SOLUTION: In the lab, Dale has two solutions that contain alcohol and is mixing them with each other. He uses twice as much Solution A as Solution B. Solution A is 15% alcohol and Solution B
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Question 1109364: In the lab, Dale has two solutions that contain alcohol and is mixing them with each other. He uses twice as much Solution A as Solution B. Solution A is 15% alcohol and Solution B is 19% alcohol. How man milliliter of Solution B does he use, if the resulting mixture had 392 milliliters of pure alcohol? Answer by ikleyn(52775) (Show Source):
Let x = "How many milliliters of Solution B does he use".
Then the amount of the pure alcohol in the mixture is
0.15*(2x) + 0.19*x milliliters,
and your equation to find "x" is
0.15*(2x) + 0.19*x = 392.
The rest is just arithmetic.
