Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Can it be possible to build a house that has all its four walls facing towards the South?

Can you count the number of matches in the picture below ?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Spot the cat in the picture below

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?