Two bags contain marbles. Bag 1 contains 1 black marble and 9 white marbles. Bag 2 contains

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Two bags contain marbles. Bag 1 contains 1 black marble and 9 white marbles. Bag 2 contains 1 black marble and x white marbles. If you choose a bag at random, then choose a marble at random, the probability of getting a black marble is 2/15. How many white marbles are in bag 2?

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