SOLUTION: A 30 ml solution of alcohol and water is 10% alcohol. How much water must be added to result in a 5% solution?

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Question 451451: A 30 ml solution of alcohol and water is 10% alcohol. How much water must be added to result in a 5% solution?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.10*30 + 0.00*w = 0.05*(30 + w)
==> 3 = 1.5 + 0.05w
==> 1.5 = 0.05w
==> w = 30 ml of water must be added.