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Romans used another system of numbers, very difficult to do any math calculations with, and missing the concept of zero. The Arabic numerals we use today successfully replaced the unwieldy Roman numerals.
in roman X
538
XII
CXXVI
XXIV
roman numarals are v,i ,x,c and some other stuff with represent numbers
L
Your answer is XXI
CCCLXII
DCC
1 = I
XXXIX