What has no start, end, or centre?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

What can go through glass without breaking it?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How can you tell a raw egg from a hard-boiled egg?

What does below Rebus say?

XLR8

Can you find out the number that should replace the question mark with a valid reason?

With the help clues provided in the image, can you find the 5 digit key?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?