If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

What do you answer even though it never asks you questions?

A blonde put eyeliner on her head. Why?

What work can one never finish?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

How can you make a TV, a bed, a dog, and a car liquid?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Imagine you are in a room with no windows or doors. How will you get out?