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?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

What is always in front of you but can’t be seen?

Make a sentence consisting of three words that have the whole alphabet.

How can you write nineteen in a manner that if we take out one, it becomes twenty?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Imagine you are in a room with no windows or doors. How will you get out?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Can you find a number that lies one third of the distance between 1/3 and 2/3?