The weights of five boxes are 30, 40, 40, 70 & 90 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes?
Addition of 180 kilograms = 30 + 40 + 40 + 70
Addition of 190 kilograms = 30 + 70 + 90
Addition of 200 kilograms = 30 + 40 + 40 + 90
But we cannot get 210 by adding given weights.
$$\therefore$$ The correct answer is option is A.
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