-21, 27
99
251
99
-3888
-117
-21, 27
391
38
99
135 = 3 x 45 or 5 x 27 or 9 x 15 None of these pairs add to 27.
29
251
If they are equal numbers then n = n Hence n + n = 54 2n = 54 n = 54/2 n = 27 So 27 + 27 = 54
This is not possible, 27 is an odd number, 4 odd numbers will always equal an even number.
27
27 + 27