It is: XLL = XC = 90
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It is the equivalent of 9*90 = 810 which in Roman numerals are DCCCX
XVII
First, XL represents 40 since L is 50 and X is 10. A larger number following a smaller one causes you to subtract the numbers. L is another 50, so XLL is 90. XLL is not used since XC is shorter and also represents 90.
Those Roman Numerals mean 1991.