Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Can you solve this picture maths equation?

If an electric train is travelling south, then which way is the smoke going?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.