1,042
8149 + 2176 + 138 + 14786 = 25,249
Sum = 79*(79+1)/2 = 79*80/2 = 3160
79 + 79 = 158
a + 79
79 + 79 = 158
69 + 69 = 138.
79 + 79 = 158 / 2 = 79.
79
The solution to 79 plus 39 is 118. The solution to 79 minus 39 is 40.
200 plus 79 equals 279
15 + 41 + 23 = 79