Can you count the number of lines in the below picture?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

If eleven plus two equals one, what does nine plus five equal?

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

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Replace the question mark with the number below given a simple math problem.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What has one eye, but can’t see?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?