Question
How much water is to be added to 75 ml of alcohol, so
that the mixture contains 20% of alcohol?Solution
ATQ,
Pure alcohol = 75 ml Final solution should be 25% alcohol Need to find: How much water to add Let water added = x ml So, total solution = 75 + x ml We want alcohol to be 25% of the total solution: 
On Solving the equation: 
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