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1. |
The weights of 4 boxes are 20, 30, 40 and 60 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? |
A. | 150 |
B. | 110 |
C. | 130 |
D. | 140 |
Answer» E. | |