L is fifty.
X is ten.
I is one.
50 + 10 + 10 + 10 + 1 is 81, so LXXXI is the answer.
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LXXXI is 81
81
Lxxxi is a Roman numeral that represents the number 81.
In today's modern notation of them they are IV, XXIX and LXXXI respectively
The Roman numeral LXXXI represents the number 8150 + 30 + 1 = 81