Why Aeroplane windows are round?

What number should come in place of the question mark below?

Can you find out the total number of triangles in the given figure?

A fresh card pile is taken out of a box (the pile has 54 cards including 2 jokers). One joker is taken out and then the cards are shuffled for a good amount of times. After shuffling, two piles are made by dividing that one pile.



What is the possibility that one of the piles will have a card sequence from A to K in order?

What is the fastest way to double your money?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

There is something which you can be arrested for attempting but not for successfully completing.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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

Guess the hidden movie name?