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

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

What does this rebus means ?

PROG WORKRESS

Take away the whole and some still remain. What is it?

Can you find the hidden animal in the picture below?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

A Detective reviewed the information they had on the case so far.

A lady named 'Caterina' was found shot and they already had a list of suspects - Ankit, Tarun, Harish, Manoj and Manish.
The killer is a fan of challenges him by leaving notes ad various places.
* The first was found in a toilet room.
* The second was found in an art room.
* The third was in a restroom.
* the fourth in an underwater room.
* The fifth at the no-smoking room.

All of the notes read the same thing, 'The clues are where you find the notes.' Yet, nothing was found at any place the notes were.
Detective the genius, immediately solved the case.
Who was the killer?

What number divided by 4 is the same as that number minus 4?