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Question

A man initially has a mixture of milk and water, with 80% of the mixture being milk. He sells 20 litres of this mixture and replaces it with the same amount of water. After this, the quantity of water in the mixture becomes 40 litres. What was the total quantity of the original mixture?

A 120 litres

B 135 litres

C 100 litres

D 80 litres

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