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I have a bag of N white marbles. I paint 20 of the marbles black. Later, my sister pulls out 30 marbles, and I tell
I have a bag of N white marbles. I paint 20 of the marbles black. Later, my sister pulls out 30 marbles, and I tell her that my best guess is that 12 of them will be black. How many marbles are in the bag
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