Puzzle 1: You are wandering around in the desert and are exhausted. You meet a nomad and ask him for the way out.

There are only two choices to pick: either go to the left or to the right. One way leads to an oasis and the other way is “the road to death”. However, the nomad is a liar and you cannot trust him.

But you know for certain that he is systematically lying: If he lies on one day, he will not lie the following day and vice versa.

You can ask him only one question and he will answer with “yes” or “no”.

What question do you ask him in order to survive?

Answer: “If I had asked you yesterday about the way to the oasis, would you have told me to take the way to the left?”

If the nomad answers with “yes”, pick the right way, otherwise go to the left.

Puzzle 2: Add the following numbers:

Answer: Do you think the result is 5000?

Actually, it is not. The correct result is 4100.

Puzzle 3: Can you place six X’s on a Tic Tac Toe board without making three-in-a-row in any direction?

Puzzles 4: All day I move to and fro,

You watch me daily and

You make me dance all the time to pass by.

Who am I?

Explanation: All day DOOR move to and fro,

We watch Door daily and

We make DOOR dance all the time to pass by.

Puzzle 5: If

526 = 9

834 = 9

Then

716 =?

A. 20

B. 15

C. 9

D. 12