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.
If you can answer it, then it is not that hard!
Simple Math was created on -20-12-08.
9/12 = 15/20
400, this isn't a good site to be doing your math homework on.
12 of course !
Iy equals to 240.