Why do you find that most of the buildings are deprived of the 13th floor?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

why number 8549176320 is one of a kind?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

I add 5 to 9 and get 2. The answer is correct, so what am I?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Can you count the number of triangles in the given figure?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?