In a vase are 10 more black marbles than white marbles.

probability/marbles.ten.more New, unsolved

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Problem

In a vase are 10 more black marbles than white marbles.  If you take 2
marbles at random, the chance on 1 black and 1 white is 50%.  How many
marbles are in the vase?

-- Mark van Hoeij <hoeij@sci.kun.nl> (posted as an ObPuzzle)

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