Math Problem : LLL.2 Find the road to paradise

While wandering about the wilderness without any water and food and it had been utterly ruined, there are right and left roads toward hell or paradise and JIZO (the guardian deity of children) was standing there.
The way of reply of JIZO to your inquiry is only shaking or nodding its head and moreover, it is not understood that it is a liar JIZO or a honest JIZO.
What is the right inquiry to find the road to paradise by only once?









Answer
The right inquiry is 
“Is my thought that you nod if it is asked that a left road is a road to paradise is correct?”

Solution
It is said that you should ask “when you are inquired that the proposition (statements that are classified as either wrong or right) that a left road is a road toward paradise, your reply is yes. Am I correct ?”
[ A left road is a road to paradise. ] is a proposition.
If this proposition is right and liar JIZO would shake its head to the inquiry, it is honest as a reply to the inquiry which is against liar JIZO.
If this proposition is wrong and liar JIZO would nod its head to the inquiry, it is also honest as a reply to the inquiry.

As such, the reply of liar JIZO comes to the same as honest JIZO. 
You can get right reply from both JIZO.