XX is 20 in Roman numerals
20 = XX
you write 71 as LXXl and 20 as XX
XX
XX.VI.MCMLXXVI
To write 20 in Roman numerals, you would use XX. To write 30, you would use XXX. Therefore, to write 20-30 in Roman numerals, you would write XX-XXX.
II.XX.MMI
I-XX-MMIX
It is: I-XX-MMI
Xii-12 xx-20 mcmxc-1990
X-XX-MMIII
83 = LXXXIII or as XXCIII (103-20)
V-XX-MMX