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Question

A vessel contains 72 litres of a milk-water mixture in the ratio 5 : 4. Some quantity of the mixture is removed and replaced with pure water. After this operation, the ratio of milk to water becomes 5 : 7. How many litres of mixture were removed?

A 18 litres

B 22 litres

C 10 litres

D 21 litres

E None of these

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