15,10, and 16
If you multiply 15 by 10 you will get 150. Then you multiply 150 by 16 and you will get 2400.
2250
83
15
3, 7 and 11
-117
-31
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
3 and 4
-13