I would like to understand how to frame a question such that that answer to the question should be the numerical number.
For e.g. the answer should be: Bill Clinton is the Nth President of USA.
Hope this is clear
Bill Clinton is the Nth President of USA.
First, ask yourself what 'Nth' is.
Nth - ranking/position as President of USA
So, the question:
What is Bill Clinton's ranking/position as President of USA?
not a teacher