What has many keys but can’t open a single lock?

The more of this there is, the less you see. What is it?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

What is the riddle which can be asked all day with a different correct answer each time.

I don't get anymore wetter, no matter how much rain falls on me.

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?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.