2250
83
15
3, 7 and 11
-31
-117
29
All of its multiples from 3 to 999
The two numbers that add up to 5 and multiply to -6 are 3 and -2. This is because 3 + (-2) = 1 and 3 * (-2) = -6. These two numbers satisfy both conditions given in the question.
109
-13
-30 and 3