Why are all black people so quick ?

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

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Which five letter word can be added at the end of below word to form a
valid word?

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I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

Can you make four (4) nines (9) equal 100?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?