Find the next number in the series below

21 32 54 87 131 ?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

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?

Find the smallest sentence with all the English alphabet.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Which Burger Is Different in below image?