There was a strange boy who was born before his father. How can this be possible?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What does a man do only once in his lifetime, but women do once a year after they are 29?

Can you solve the maths in the below-given picture equation?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What's the only room from which no one can enter or leave

I have an eye but still cannot see.

Who am I?