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小學二年級奧數 :幾多 - 8 = 9

Level 2 blank = 31
17-11 = 6, 19-13 = 6, 6+6 = 12
28-22 = 6, 35 - 27 = 8, 6+8 = 14
33-24 = 9, 15-9 = 6, therefore 25+6 = 31
Just a guess

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