IX (9) + XV (15) + XX (20) = XLIV (44)
vii,viii,ix xiii,xiv,xv xviii,xvix,xx
9 or IX
I, II, III, IV, V, VI,VII,VIII, IX, X, XI, XII, XIII, XIV, XV, XVI,XVII,XVIII, XIX, XX.
Either I-XX or I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX.
September 15, 2010, in Roman numerals is written as XV-IX-MMX.
If you mean the roman numerals, then IX = 9 and XI = 11, and 11+9=20 which can be written as XX.
It is: IX-XV-MMXII
XV-IX-MMXII
Louis XV is not a saint. Louis IX is a saint, however.
nine & fifteen respectively
IX-XV-MMXI
You write them: I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX.