268
91
I suppose you could use -42 twice. -63 and -21
They add up to 135
2 + 29 + 53 = 84
-76
The factors of 21 that add up to 8 are 1 and 7.
72, 81, 90
Well, isn't that just a happy little question! Yes, 243 is divisible by 3. You see, when you add up all the digits in 243 (2 + 4 + 3), you get 9, which is a multiple of 3. So you can easily divide 243 by 3 and create a beautiful, harmonious result.
None. Factors don't add, they multiply.
41 and 43
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.