Which number should replace the question mark?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

If eleven plus two equals one, what does nine plus five equal?

Which Burger Is Different in below image?