40 litres of milk contain 10% water. Find the quantity of water to be added to the milk, so that it may contain 20% water.
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Answer: Amount of water = 10% = 10/100x 40=4 liters amount of milk 40-4=36 liters. Milk 10 = 40 liter; water 100 = 1 liter; mixture 20= 40l x l= 10*40 + 100x = 20 (40+x)x=5. The answer is 5 liters of water.
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