Not if you keep the ' l ' before the ' XX ' where it belongs. If it's before, then it means take the ' l ' away from them, and you get 19 just as you should.
Now I understand this crazy question that keeps coming around.
9+10=19 not 21 and in roman numerals IX+X equals IXX because if you put the "I" in front of the "X" it means that the number is 1 less than the value X ("X" in roman numerals equals 10 and "I" equals 1). Also if you put the "I" after the "X" it means that the value of that roman numeral is 1 more then "X".
