A mixture of 50 litres of milk and water containing 20% water is further diluted with water so that the mixture has 30%

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A mixture of 50 litres of milk and water containing 20% water is further diluted with water so that the mixture has 30% water in it. How many litres of water should be added?

A. 40/70
B. 4/7
C. 6.14
D. 7
E. 7.14
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