80
Sum = 79*(79+1)/2 = 79*80/2 = 3160
78 + 1 = 79
1,042
The answer is 169.78. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
79 + 79 = 158
a + 79
79 + 79 = 158
79=1+3n79-1=1-1+3n78=3n78/3=3n/326=nn=26
79 + 79 = 158 / 2 = 79.
79
How about: LIII+XXVI = 79 which is 53+26 = 79
The solution to 79 plus 39 is 118. The solution to 79 minus 39 is 40.