Alligation or Mixture problems
In what ratio must water be mixed with milk to gain 16⅔% on selling the mixture at cost price?

6 : 1
2 : 3
4 : 3
1 : 6

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Alligation or Mixture problems
Two solution of 90% and 97% purity and mixed resulting in 21 liters of mixture of 94% purity. How much is the quantity of the first solution in the resulting mixture?

6 litres
9 litres
15 litres
12 litres

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