19 because x is 10 and I is 1 and if a smaller number is in front of a larger number then you subtract the smaller number from the bigger number so it would be 10-1 which is 9 so it is 19
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In today's notation of Roman numerals it represents 19
XIX is 19 in Roman numerals.
The Roman numeral XIX the same as 19 in Arabic numerals.
XIX in Roman numerals is 19 in standard numerals.
XIX