I is one, V is five, X is ten, so XXX is thirty....
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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.
It's thirty thousands.
It is: XI-XXX-MMXVI
It is: IX-XXX-MMVI
XXX-III-MMXI