Black & White
A white mixture is stored in 10x10x1 container. Now, we remove a unit volume from the mixture and add the same volume of a black mixture into it. Then the mixture is stirred hard to make it homogeneous. Next, we do the same again, i.e. remove a unit volume from it and replace it with the black one followed by a proper stirring. After how many stirrings will the mixture start looking more black?
The answer is 57.
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