Brainteaser for July 29, 2011

Brainteaser for July 29, 2011 Question: We place in a box thirteen white marbles and fifteen black. We also have twenty-eight black marbles outside the box. We remove two marbles from the box. If they have a different colour, we put the white one back in the box. If they have the same colour, we put a black marble in the box. We continue doing this until only one marble is left in the box. What is it's colour? Click here to check your answer. Find more Brain Teasers, Puzzles and Games to challenge the mind at The Brainteasers Network

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