I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, VX, XV, XVI, XVII, XVIII, XIX
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M=1000 X=10 V=5 I=1 Therefore: 1-19-2005 = I-XIX-MMV
XIX-I-MMXII
This math riddle relates to Roman Numerals where 19 is IXX, 1 is I, and 20 is XX. By removing I from IXX, you are left with XX.
In todays modern notation of Roman numerals it is XIX But there is evidence to suggest that the ancient Romans would have calculated 19 as XVIIII and simplified it to IXX (20-1) in written form.
x=10 so 10+10-1=19 The answer is 19