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?

O_er_t_o_

Complete the missing letters of the given word.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Name a key which is hardest to turn.

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

You need to move three matchsticks to form three squares. Can you do it?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

What does below Rebus say?

XLR8

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?