I got it from my Psychology studies (five years of statistical analysis), I.T. work (data analysis and presentation) and just generally reading around stuff.

I can do arithmetic, algebra, (Predicate) Logic, Set Theory (including Fuzzy Set Theory) and various other wild-and-wonderful stuff with relational analysis techniques … but, otherwise, I’m utterly hopeless at Maths and all but burst into tears when confronted with it ¹ — in class 2+2=4, in homework 2x2+4=8, but I‘m damned if I’ve got a clue what’s going on in the exam ² and, as far as I am concerned, the problem stems from the fact that mathematicians inhabit an abstruse realm located deep within their own recta ³.

—
¹ Well, okay, I become agitated … with side orders of shouting, inventively vicious invective and threats of grievous bodily harm … even arson … against its perpetrators, but you take my point.

² If Bobby has two apples and his train is twelve minutes late, what is the mass of the Sun?

³ I can think of no other reason why anyone would think of applying trigonometric functions to linguistic analysis — who in their right mind figures that the meaning of an utterance would be best determined by finding the cosine of Thursday!?