20 + 10 - 31 + 30 - 5 = 24
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10 minus -20 is 30.
16.8 6.8 + 30 - 20 = 6.8 + 10 = = 16.8
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
30/0.5 = 60 + 10 - 2 = 68