The answer is 105. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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How about: LIII+XXVI = 79 which is 53+26 = 79
79 + 79 = 158
Sum = 79*(79+1)/2 = 79*80/2 = 3160
15x26=390
79 + 35 = 114