578 + 945 = 1523
100 + 700 = 800
The answer is 1400
700 + 60 + 8 = 768
700 + 700 = 1400 DCC + DCC = MCD
1500 + 700 = 2200
700 + 4 = 704
50 + 700 = 750
7000 + 700 = 7700
5 + 700 = 705
200 + 500 = 700
700 + 80 + n = 780 + n = 700 + 80 + n = 700 + 80 + n = 700 + 80 + n = 700 + 80 + n = 0 = 0