Correct: 12 + 3 = 15, 20 + 20 = 40, 100 + 20 = 120, 100 + 200 = 300, 20 - 5 = 15, 50 - 20 = 30, 200 - 50 = 150, Incorrect: 12 + 10 = 13, 20 + 20 = 50, 100 + 20 = 150, 100 + 200 = 120, 20 - 5 = 5, 50 - 20 = 3, 200 - 50 = 100,

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