If you say my name, I will no longer exist. What am I?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you name some countries which do not have the alphabet 'A' in them?

Find the hidden tiger in the given optical illusion ?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

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

Do you know what I am?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. 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?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?