What has no start, end, or centre?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A father's child, a mother's child, yet no one's son.

Who am I?

What is always in front of you but can’t be seen?

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

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?