They sum up to 15
(9 + 15)/(-5 + 1) = 24/-4 = -6.
9
6+9= 15
152
15
It is: 6+9 = 15
It is: 2/15 plus 3/9 = 7/15
-3
6 and 9. 6 + 9 = 15 6 * 9 = 54.
The numbers are 9 and -6 because 9-(-6) = 15 and 9+(-6) = 3
11+13 is 24. If you believe 9, 15 are between 9 and 15 (I don't) it would be 48