A milkman makes 20% profit by selling milk mixed with water at Rs. 9 per litre, if the cost price of 1 litre pure milk is Rs. 10, then the ratio of milk and water in the said mixture is = ?
Options:
A. 3 : 1
B. 4 : 1
C. 3 : 2
D. 4 : 3

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Answer: Option A

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