The weights of 4 boxes are 20, 30, 50 and 70 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?
Weights of 4 boxes = 20, 30, 50 and 70 kilograms
(A) : 170 = 20 + 30 + 50 + 70
(B) : 160 = not possible
(C) : 120 = 50 + 70
(D) : 150 = 30 + 50 + 70
=> Ans - (B)
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