1.

A milkman makes 20% profit by selling milk mixed with water at $ 9 per litre. If the cost price of 1 litre pure milk is $ 10, then the ratio of milk and water in the said mixture is

A. 3 : 1
B. 4 : 1
C. 3 : 2
D. 4 : 3
Answer» B. 4 : 1


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