A jar full of whiskey contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohols and now the percentage of alcohol was found to be 26%. The quantity of whisky replaced is

• By the rule of alligation, we have:
  
  1st 2nd
  40% 26%
  
  19%
  
  7 14
  
  So, ratio of 1st and 2nd quantities = 7 : 14 = 1 : 2
  
  Required quantity replaced = 2/3
  
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