15 litres of a mixture contains alcohol and water in the ratio 1 : 4. If 3 litres of Water is mixed in it, the percentage of alcohol in the new mixturewill be
total quantity = 15L
alcohol : water = 1 : 4Â
            = 3 : 12Â
now 3 liters of water is added, so now ratio becomes 3 : 15
% of alcohol = 3/(3+15) *100
          = 3/18 *100
         = $$16\frac{2}{3}$$
so the answer is option B.
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