50 - 20 = 30
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XXLII is not a Roman numeral as it does not conforms to the rules of writing numerals. If it were a numeral you might suppose that it would represent... (20 less than 50) + 2 which is of course 32 but the correct Roman numeral for 32 is XXXII
M = 1000, XL = 40 (10 less than 50) so MXL represents 1040.
75 50 + 20 = 5
It is: 50-30 = XX = 20
1944 M = 1000 CM = 900 (100 less than 1000) XL = 40 (10 less than 50) IV = 4 (1 less than 5)