15, 30, 45, 60, 75, 90 and so on.
The answers are: -5*-3 = 15, -8*7 = -56 and -4*-12 = 48
Any number adds to 15.
15
38
15, 30, 45, 60, 75, 90 and so on.
23
The answers are: -5*-3 = 15, -8*7 = -56 and -4*-12 = 48
143
12,24,36,48,60,72,84,96,108,120,132, and 144
-7
-4 plus/minus square root of 15.
143
28
Any number adds to 15.
-4 plus/minus square root of 15.
77, 154, 231 and so on.