SOLUTION: A pharmacist has 4 quarts of a 15% solution of iodine. How much alcohol must be added to reduce it to a 10%solution of iodine?

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Question 1071077: A pharmacist has 4 quarts of a 15% solution of iodine. How much alcohol must be added to reduce it to a 10%solution of iodine?
Answer by Alan3354(69443) About Me  (Show Source):
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A pharmacist has 4 quarts of a 15% solution of iodine. How much alcohol must be added to reduce it to a 10%solution of iodine?
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Assuming alcohol is a solvent for iodine,
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Add Q quarts
4*15 + Q*0 = (4+Q)*10
Q = 2