Count the number of lines in the image below ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Find the missing letter in the last circle logically in the given below picture.

What goes up but never comes down?

Can you decipher the below rebus?

PBLUESAISNUERSES

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Which alphabet letter is a question?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?