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Option 2 : 130
Sum of weight of all the boxes = 20 + 40 + 50 + 30 = 140 kg
Sum of weight of two boxes having weight of 40kg and 50 kg = 40 + 50 = 90 kg
Sum of weight of three boxes having weight 40 kg, 50 kg and 30 kg = 40 + 50 + 30 = 120 kg
As we have found the possibility of three weights, hence by elimination method we can say that 130 kg weight is not possible from the given weights.
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