A mixture of 72 litres contains alcohol and water in the ratio 5:4. How many litres of alcohol and water each must be added to the mixture to make the ratio 6:5?
A) 12 B) 9 C) 10 D) 8

• alcohol quantity is (5/9)72=40 lits
  water quantity is (4/9)72=32 lits.
  now let x lits is added to both alcohol and water
  (40+x)/(32+x) =6/5
  we get x=8
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• Ans : D)8
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