a sum is equal to the two numbers being added together, so the sum of two and four is six or:
2+4 = 6
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It is (55.00+535.00) -(215+60) = 315 much more
A hexagon cannot have a sum. There can be the sum of its interior angles, its exterior angles, its side lengths, its area (and that of some other area), or other characteristics, but not of a hexagon.
'Sum' is pretty much a synonym for add, and 5+5 or 5 plus 5 is 10.
The interior angles sum to 1980 degrees.
Since the average is the sum divided by 10 (in this case 10, because there are 10 data items), it follows that the sum is 10 times as much.