My nephew many times asks silly questions. Here is one.
If 60 = LX
Then 80 = X
Can it be?
(His answer was silly too)
60 = "sixty" = "six t" = 6 * 10 = LX in Roman numerals
80 = "eighty" = "a t" = 1 * 10 = X in Roman numerals
If you assume the same rules as roman numerals but redefine the values, so that X=80 and L=20, both statements will be true.
Seems a bit overbroad, maybe the correct answer will fix that. In the meantime, here are a couple of the other kind.
perfectly fine maths, if L equals 0.75.
looking upside down, it kinda looks like XI = 09, from which it would be sensible to deduce that X = 08
You need 4 line strokes to write LX, that means you got a score of 100 - 4 * 10 = 60.
Hence, because X only needs 2 line strokes, you will get 100 - 2 * 10 = 80.
X means there's a cross in the number, and LX means there's a lack of a cross in the number. In this case, 60, "lacks a cross", and 80 has a "cross" because of the number 8?