Before Mount Everest was discovered, what was the highest mountain in the world?

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?

The more you take me, the more you leave me behind.
Who Am I?

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?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

If you say my name, I will no longer exist. What am I?

During which month do people sleep the least?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

I am the fastest animal but cannot climb the tree. What am I?