בבא בתרא קעא

In an elementary school math class, the teacher asked a student: “If I borrowed a $100 from your father and paid him back $30, how much do I owe him?”  The student answered with a question of his own: “Did you get a receipt?”  “No,” the teacher said.  “Well, then you owe him a $100.”  Shocked, the teacher said: “You’re going to fail this class.  You don’t know any math.”  The student replied: “I know math. You don’t know my father.”

06/10/2021