15 and 4 are the factors of 120 that add up to 19.
47
146
-1, 6 and -12.
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.
139
113
{12, 10, 1} or {15, 8}
91
Since 19 is a prime number, it only has two factors - 1 and 19.
-10 and 2 -12 and 4 -20 and 12
-19