It isn't. I is 1, V is 5, X is 10, L is 50, C is 100, D is 500, and M is 1000, and Roman numerals are written in descending order, except when subtracting a power of 10 (1, 10, 100, 1000, etc.) from 5 or 10 times that much to get a lesser number. Thus, LV is 50 + 5 = 55. But VL is Vulgar Latin, meaning Latin spoken by the common populace. Or it could stand for Virgin Lips, meaning having never kissed anyone.
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45
VL is not a valid roman numeral. Someone may have been trying to use a shortcut to write 45, which is supposed to be XLV, or the sequence in question may not have been intended as a roman numeral at all.
The Romans themselves would have probably notated 45 as VL but the rules governing today's Roman numeral system, which were introduced during the Middle Ages, gives 45 as XLV in Roman numerals.
Roman numeral V means 5. Roman numeral lV means 4; and Vl means 6. :)
45 but under today's notation of Roman numerals it is written out as XLV