Resultado igual a 20: 2 X 10 =, 4 X 5 =, 5 X 4 =, 10 + 10 =, 15 + 5 =, 18 + 2 =, 20 + 0 =, 30 - 10 =, 40 - 20 =, 50 - 30 =, 22 - 2 =, 25 - 5 =, 26 - 6 =, 27 - 7 =, 70 - 50 =, Incorrecto: 2 X 11 =, 4 + 5 =, 5 + 13 =, 10 + 11 =, 15 + 6 =, 18 + 3 =, 20 + 2 =, 30 + 10 =, 40 + 20 =, 50 + 30 =, 22 + 2 =, 25 + 5 =, 26 + 6 =, 27 + 7 =, 70 + 50 =,

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