Advanced Real world

Analyze the patterns and solve the equations!

1) Solve
632
2) Solve
312
3) Solve
903
4) Solve
DCXXV
5) Solve
CD
6) Solve
DCIX
7) Solve
396
8) Solve
231
9) Solve
47
10) Solve
DCCCXXXI
11) Solve
CXL
12) Solve
CCCLXX
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