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Ratios and Proportions : Dilution of Solution

Chemist has 400ml of solution of which 80% is alcohol. How much water needs to be added to dilute solution to 50% alcohol? Please provide step by step breakdown so I can understand how this is solved.

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Solution. First of all, we need to figure out how many ml alcohol. Say, x ml. We know that

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Dilution of a solution is investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.