15 and 5
12 and 8
10 and 10
15 and 4 are the factors of 120 that add up to 19.
146
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.
-10 and 2 -12 and 4 -20 and 12
-1, 6 and -12.
31
None of the factor pairs of 120 add up to -14. If that was -120, you could use -20 and 6.
26
34
79
113
-13