Puzzles 3

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?

Puzzle 2: Add the following numbers:

Take 1000 and add 40. Now, add another 1000. Now add 30. Now, add 1000 again. Add 20. And add 1000 again. And an additional 10.

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?

Puzzle 5: If

526 = 9

834 = 9

Then

716 =?

A. 20       B. 15        C. 9        D. 12