Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

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

How can you drop a raw egg from a height onto a concrete floor without cracking it?

John's five friends Rachel, Jacob, Phoebe, Joey and Chandler live on the same road.

Rachel lives in the house: A, Jacob lives in the house: B, Phoebe lives in the house: C, Joey lives in the house:D, Chandler lives in the house: E

Mathematically
B*C*D = 1260
B + C + D = 2E
2A = E

The road numbers run from 2 to 222.

Can you tell me the house number of each of John's friends?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Can you find the thief by just looking at the picture below?

Identify the next two numbers in this series.

101, 112, 131, 415, 161, 718, ???, ???

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

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?