Advanced Real world

Analyze the patterns and solve the equations!

1) Solve
279
2) Solve
447
3) Solve
394
4) Solve
755
5) Solve
358
6) Solve
267
7) Solve
CCCXXXI
8) Solve
701
9) Solve
CDLXXXV
10) Solve
DCLXXXVII
11) Solve
DCCLIII
12) Solve
906
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