Very few are good at both [including me!]. I think maths is spoiled for a lot of people by crap teaching, though. A teacher like Youtube/Khan Academy's
vihart, for example, could make all the difference, if you could get her to slow down a bit
More folks seem to have bad patterns around maths than drawing, even, which is saying something.
"To learn who rules over you, simply find out who you are not allowed to criticize" - Voltaire