There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What building has the most stories?

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

You need to move three matchsticks to form three squares. Can you do it?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

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

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?