Conversation between a mother and the son SON: . . .

Conversation between a mother and the son
SON: I dont like my math teacher
Mother: Why?
SON: He is very confused!
MUM: How?
SON: Day before yesterday he said 5+4=9, yesterday he said 3+6=9 and today he said 2+7+9
MUM: What! Can you imagine? I told your dad I never liked that school...You are leaving there tomorrow