The weights of 4 boxes are 100, 90, 80 and 40 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of theseÂ boxes and in a combination a box can be used only once?

The weights of 4 boxes are 100, 90, 80 and 40 kilograms. Which of the

1.	The weights of 4 boxes are 100, 90, 80 and 40 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of theseÂ boxes and in a combination a box can be used only once?
A.	200
B.	310
C.	230
D.	210
Answer» B. 310