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A man buys milk at Rs. 5 a litre and mixes it with water. By selling the mixture at Rs. 4 a litre he gains 121/2 % on his outlay. How much water did each litre of the mixture contain?

32 litre 45
13 litre 45
32 litre 13
None of these

Correct Answer: 13 litre 45

Explanation:

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