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Option 1 : 200
The weight of 4 boxes are 90, 40, 80 and 50 kilograms.
1) 200 = cannot be the total weight.
2) 260 = 90 + 40 + 80 + 50
3) 180 = 90 + 40 + 50
4) 170 = 90 + 80
Thus, 200 is the correct answer.
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