1-2 equals -1. 2-3 equals -1. -1 plus -1 equals -2. as in all mixed sign problems, the answer to each part of the problem takes on the sign of the larger number.
The answer is n + 1610.
12 + 23 + 45 + 67 + 16 + 18 + 45 = 226
4*12 + 3*23 = 117.
11
2/12 + 2/12 + 4/12 + 9/12 + 6/12 = 23/12 or 1 and 11/12
13 + 23 + 12 + 7 = 55
12 + 15 + 63 + 12 + 24 + 34 + 23 + 15 = 198
90
12
1 + 2 + 1000 + 300 + 23 + 12 = 1338
The answer is n + 1610.
12 + 23 + 45 + 67 + 16 + 18 + 45 = 226
23 + 10 - 12 = 21
4*12 + 3*23 = 117.
60.
88
12 + 11 = 23