Alligation or Mixture problems
In what ratio must water be added to spirit to gain 25% by selling it at cost price?

4 : 3
3 : 4
1 : 4
4 : 1

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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?

18 litres
42 litres
32 litres
24 litres

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