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XV is already in Roman numerals. It translates to 15 in westernised Arabic numerals, i.e. our usual notation.
XV = 15 __ XV = 15000 (A bar over a number means to multiply it by 1000) __ XVM = 16000
in roman X
538
XII
CXXVI
roman numarals are v,i ,x,c and some other stuff with represent numbers
L
Your answer is XXI
CCCLXII
DCC
1 = I
XXXIX