To 15 lts of water containing 20% alcohol, we add 5 lts of pure water. What is % alcohol.

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1. 15%

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2. saying 20%alcohol in 15 litre solution.

   It means (20/100)*15=3 litres

   Now 5 litre of water is added not alcohol.

   So it means only the volume of solution is increases by 5 not alcohol.

   It means 15+5=20

   Now % of alcohol is

   (3/20)*100=15%.

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