SOLUTION: Please help me answer this question. How much water should be added to a 22 mL of 15% alcohol solution to reduce the concentration to 11%?

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Question 831848: Please help me answer this question. How much water should be added to a 22 mL of 15% alcohol solution to reduce the concentration to 11%?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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15*22 + 0x = 11(x + 22)
330 = 11x + 242
11x = 88
x = 8
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add 8 mL of pure water
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