If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

Do You See It?

Count the number of balls in picture below:

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?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?