What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

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

Replace the question mark with the correct number in below Picture:

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

It is always ahead of me yet I can never see it. What is it?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. 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. Can you tell me how that was possible?”

If two's company, and three's a crowd, then whats four and five ?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?