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

How many times can you subtract the number two from the number fifty?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

How many sides does a circle have?

What jumps when it walks and sits when it stands?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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