What is common among 11, 69, and 88?

What jumps when it walks and sits when it stands?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

The dirtier I get, the whiter I look. Who am I?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

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?

I don't get anymore wetter, no matter how much rain falls on me.

What is the coolest letter in the alphabet?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?