Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

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?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

How many times do a clock's hands overlap in a day ?

What is the difference between a jeweller and a jailer?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Can you place six X (crosses) in below board without making three in a row in any way ?

What breaks yet never falls, and what falls yet never breaks?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?