CAT Exam Numerical Ability Alligation or Mixture

a 100 litres spirit water solution contain 75% spirit. find the amount of water to be added to convert it into 60% spirit solution

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25 litres

In 100 litres, Spirit=75 litres, so Water=25 litres.
Let 'x' litres of water is added, so that spirit is 60% in a solution, then 75/(100+x) = 60/100
5/(100+x) = 1/25
x = 25
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25 litres.
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