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 t

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answerhappygod
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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 her t

Post by answerhappygod »

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 7.5 of them will be black. How many
marbles are in the bag ?
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