4x15=60
5x12=60
There are no such numbers.
The two numbers you are looking for are -15 and 4. When you multiply -15 and 4, you get -60, and when you add them together, you get -13.
83
60
12 and 5
-56
-56
-56
If you've written that correctly, there aren't two whole numbers that satisfy your conditions. -30 and 2 multiply to -60, but they add to -28.
59, 60
60 and 3
76