In a live poker tournament, the opponent asks how many chips I have left to. Do I have to count my chips and answer his question? Is it poker etiquette to answer the question? Is it OK to just show the chips and not count?
You do not ever have to count or tell you opponent your stack size. You will have to move your hands/arms out of the way so that your opponent can see your stack size, though.
It's the dealer's job to tell your opponent how many chips you have if your opponent asks.