Puzzles

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Question 1: You have two jugs. One jug has a content of 3 liters and the other one has a content of 5 liters. How can you get just 4 liters of water using only these two jugs?

Question 2: Suppose you are faced with two doors. One door leads to your job offer, and the other one leads to the exit. In front of each door there is a guard. One guard always tells the truth while the other one always lies. You can ask only one question to decide which door will lead you to your job offer. What will you ask and to whom?
Guys please answer these...

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