What work can one never finish?

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?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Why do Chinese men eat more rice than Japanese men do ?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

How many sides does a circle have?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?