A mixture of 150 L of wine and water contains 20% water. How many litres of water must be added so that water may be 25% of the mixture?
The mixture contains 20% water and 80% of wine.
By the rule of allegation, Ratio of wine : water = 75 : 5 = 15 : 1
For 15 L wine, 1 L water is to be added.
∴ For 150 L wine,$$\frac{(150*1)}{15}=10$$ L to be added.
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