SOLUTION: How much water should be added to 24ml of 18% alcohol solution to reduce the concentration to 12%?

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Question 879643: How much water should be added to 24ml of 18% alcohol solution to reduce the concentration to 12%?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
This lesson explains everything you need to know including the general solution:
http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev

The water is zero percent alcohol, so a term will become zero in the numerator of the equation. The concentration of alcohol changes but the QUANTITY of alcohol stays the same.

(1) Assign your variable or variables;
(2) Form your equation;
(3) Solve your equation.