Discuss and learn French: French vocabulary, French grammar, French culture etc.
it doesn't exactly means "i don't know how to answer ur question". it's rather "I have a trouble with your question".
Maybe it's because i don't know how to answer, but possible because I don't want to answer.
And yes it's used. Not every days. more often in politic talk show. (When a reporter ask a politician "how many money do you need for your project ? ... )
thanks. it's essentially the same as in english. as u pointed out, we don't know what the person who says it really means. maybe they just don't want to answer the question. or maybe it's a question that warrants a full explanation and u can't answer it briefly. so of course there are many times when people have to say "i don't know how to answer ur question"