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A mixture of 40 litres of milk and water contains 10% water. How much water should be added to this so that water may be 20% in the new mixture?
In mixture: 40 l
Milk = 36 l
Water = 4 l
Let x amount of water be added, so
4 + x = 20/100 (40 + x)
Solving for x, we get
x = 5 litres
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