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?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

John was piloting a plane behind a car but was never able to overtake it. Why?

Replace the question mark with the correct number below.

Which is faster, Heat or Cold ? Explain.

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you decipher the two rows to find the hidden word?

What is the next number in this matchsticks series riddle?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.