Mathematics, 03.08.2019 15:00 jacoblarr

Ewa 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 ewa have?

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