X is ten.
I is one.
X then I is 10 + 1, so the answer is 11.
Actually in the Roman numeric system. 'X'= 10 and 'L' = 50. When you place the smaller number in front of the larger it means that you subtract it from the larger number, so in this case. 50-10 = 40 so XL is the Roman number 40.
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