No matter how little or how much you use me, you change me every month. What am I?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

What has to be broken before you can use it?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Using eight eights and addition only, can you make 1000?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111