Correcto: 20 + 20 =40, 50+ 50= 100, 10 + 10 + 10 =30, 5 + 10 = 15, 20 + 20 = 40, Incorrecto: 30 + 6 = 360, 10 + 10 = 30, 40+ 50 = 45, 50 + 10 = 61, 50 + 10 = 10,

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