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Mathematics, 11.07.2019 02:30 lks715

Ian has 20 balls of four colors: yellow, green, blue, and black. 17 of them are not green, 5 are black, and 12 are not yellow. how many blue balls does ian have

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Ian has 20 balls of four colors: yellow, green, blue, and black. 17 of them are not green, 5 are bl...
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