Laugh Your Way Out.

                                       Rrack ur brain
A girl went to school and the teacher asked her how old are you? She replied I don't know, but
I know DAT I'm half my mother's age. The teacher asked ok how old is your mother? She said I don't know but I know DAT my Dad is 5 yrs older than my mother. Teacher asked how old is your Dad? She said I don't know but I know DAT if we add our ages together the answer is 100 yrs....
(1) how old is the girl?
(2) how old is the mum? And
(3) how old is the Dad?

Let's see who gets it right