KNOWLEDGE - VERY VERY FUNNY URDU JOKE

Math k teacher ne bachon se sawal kiya: "Agar kisi barray mein 12 bherrein bandhi hon aur unn mein se 3 bherrein bhaag jaein to kitni bherrein baqi reh jaein gi?"
.
.
.
Aik bacha kharra hua aur bola: "Aik bhi nahi."
.
.
.
Teacher ne ghussay hotay huye kaha: "Lagta hai tum math k mutalliq kuch bhi nahi jantay."
.
.
.
Bacha: "Aur sir, lagta hai aap bherron k mutalliq kuch bhi nahi jantay."