Can you replace the question mark with the correct number in the below table sequence?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

Can you move 2 matchsticks to form four equal sized squares.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What does below pictogram mean?

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?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?