20 +30 =?
50
60 + 20 = ?
80
32 + 9 = ?
41
62 + 9 = ?
71
45 + 45 = ?
90
72 + 62 = ?
134
20 + 13 + 4 = ?
37
72 + 51 + 51 =?
174
45 + _____= 67
22
72 + _____ = 144
72
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