I am an odd number. Take away a letter and I become even. What number am I?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

10+10 and 11+11 can give you the same answer.

Explain how?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What always comes into a house through the keyhole?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?