If it took eight men ten hours to build a wall, how long would it take four men to build it?

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

How is this possible?

What number when divided in half becomes zero?

The more it dries, the wetter it becomes. Can you tell what it is?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

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

Can you find the thief by just looking at the picture below?

I don't get anymore wetter, no matter how much rain falls on me.

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

what does this picture(rebus) riddle means ?