Solve this riddle by finding the odd one out from the rest.

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What's a single-digit number with no value?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

What brings you down but never up?

Eight of us go fourth, not back, to protect our king from an attack. What are we?