In the Roman numeric system, symbols are given value. When a smaller value symbol proceeds a higher value symbol, then the smaller value symbol is subtracted from the high value symbol. In this case XC is equal to 90 (X =10, C = 100. So XC equals 100 - 10 or 90).
The symbols that hold numeric are I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.
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21 in Roman numerals is XXI. 1 in Roman numerals is I. 90 in Roman numerals is XC. So, 21 1 90 would be XXI I XC in Roman numerals.
The Roman numeral XC represents the number 90
xc = 100-10 = 90
It is: XLL = XC = 90
XC = 90