327
81 and 3
268
91
They add up to 135
2 + 29 + 53 = 84
-76
The factors of 21 that add up to 8 are 1 and 7.
84
None. Factors don't add, they multiply.
72, 81, 90
The factors of 8 are 1, 2, 4, and 8. The factors that add up to 10 are 2 and 8.
Factors multiply. The same set of numbers won't add up to both 140 and 240, but 120 and 20 are factors of 240 that total 140.
-1005