You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Who has married many women but was never married?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

What you cannot hold but it is yours?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?