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 the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

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?

Give it food and it will live; give it water and it will die.

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?