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In what proportions must water be added with milk to gain 20% by selling the mixture at cost price ?
For 100 litres of milk to get 20% profit, we need to sell = $$100+(\frac{20}{100}\times100)=120$$ litres
Thus, water added = $$120-100=20$$ litres
=> Required ratio = $$\frac{20}{100}=1:5$$
=> Ans - (C)
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