SOLUTION: How much water must be added to 12L of a 40% solution of alcohol to obtain a 30% solution?

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Question 423196: How much water must be added to 12L of a 40% solution of alcohol to obtain a 30% solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
12x.4=4.8
.3z=4.8
z=4.8/.3=16
16-12=4L of water needed for the solution..