As you travel down a path leading to your destination, there comes a fork in the road. Standing before you are two sisters, twins. You know one sister tells only the truth. The other tells only lies. But you do not know which is which. You can only ask one question, to which they both shall answer. To be sure you travel on the right path, what question do you ask them?
I thought the answer to this was something to the idea of "Do you have a sister?" to which I got "If you were to ask the sisters that question, it would only tell you who is the liar, not which road to take. You see, you only have one question to ask. They would leave you at your crossroads without any direction. Would you like to think of another response?"
This is very interesting. And somewhat complicated. Which is why I'm cheating. So help please. Thank you!