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Option 2 : 130
1) 140 = 40 + 30 + 50 + 20 (It is possible)
2) 130 = It is not possible
3) 90 = 40 + 50 (It is possible)
4) 100 = 50 + 30 + 20 (It is possible)
Hence, 130 cannot be the total weight of any combination of the given boxes.
So, answer is 130.
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