With the help clues provided in the image, can you find the 5 digit key?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

81 x 9 = 801. What must you do to make the this equation true?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

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

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

My location can be determined by the below rebus.
So where am i ?