Yes, you're totally right, that's why i come to gfy to learn from perfect english speaker webmasters like you, what about your spanish?
Btw, what's the correct way to write it?
a) You've got a serious problem at maths
b) You've got a serious problem on maths
c) You have a serious problem at maths
d) You have a serious problem on maths
e) a y c are ok
f) b y c are ok
g) none of them
h) i don't want to tell you
