Can you count the number of lines in the below picture?

Find the number of squares in the below picture

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

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?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What is the riddle which can be asked all day with a different correct answer each time.

What number when divided in half becomes zero?

What question can you never answer yes to?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?