37
PS it's not because it is Hindu Arabic not roman they always said they were ROMAN numerals but anyways i don't know what it is either.
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The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of CCX are the equivalent of 210 in Hindu-Arabic numerals.
The Roman numerals of DCCC are the equivalent of 800 in Hindu-Arabic numerals
The Roman numerals of XX are the equivalent of 20 in Hindu-Arabic numerals
437 is already in Hindu-Arabic numerals