113
The factors of 21 that add up to 8 are 1 and 7.
factors of 30 that add to 17 are 2 and 15
There aren't any. All multiples of 24 are greater than 19. If you mean factors, you can use 12, 6 and 1 or 8, 6, 3, 2.
19 and 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
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
113
140
The factors of 64 are 1, 2, 4, 8, 16, 32 and 64. No two of them add up to 19.