In a mixture of $60\text{ liters}$, the ratio of milk and water is $2 : 1$. How much water should be added to make the ratio of milk and water $1 : 2$?
Options:
- A: $40\text{ liters}$
- B: $50\text{ liters}$
- C: $60\text{ liters}$
- D: $80\text{ liters}$
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