Advanced Real world

Analyze the patterns and solve the equations!

1) Solve
483
2) Solve
711
3) Solve
305
4) Solve
513
5) Solve
DCCXCII
6) Solve
948
7) Solve
DCCXXVII
8) Solve
DCCCXLVIII
9) Solve
920
10) Solve
480
11) Solve
DLXIV
12) Solve
298
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