21.

 Question: "How to kill an ant?"
Asked in an exam for 10 marks!
Student:
Mix chilli powder with sugar,
&
Keep it outside the ant's hole
After eating,
ant will search for some water near a water tank.
Push ant in to it!
Now ant will go to dry itself near fire,
When it reaches fire, put a bomb into d fire!
Then admit wounded ant in icu!
And then
remove oxygen mask from it's mouth and kill the ant :-|