Alligation or Mixture problems
6 liters of milk and water mixture has 75% milk in it. How much milk should be added to the mixture to make it 90% pure?

8 liters
9 liters
12 liters
10 liters

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Alligation or Mixture problems
A cask full of wine from which 8 litres are drawn and is then filled with water. This operation is performed three more times. The ratio of quantity of wine left in the cask to that of the water is 16: 81. How much wine did the cask hold originally?

42 litres
32 litres
24 litres
18 litres

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