The weights of 4 boxes are 30, 70, 60 and 20 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?
1)30+70+60+20 = 180
3)30+70+20 = 120
4)70+60+20 = 150
Hence every other number can be formed using 30,70,60,20 except 190. Option 'B' is correct
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