What number when divided in half becomes zero?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

The more it dries, the wetter it becomes. Can you tell what it is?

Can you move 2 matchsticks to form four equal sized squares.

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Count the number of squares in the picture below.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Who always enjoys poor health?

One of the leprechaun is missing if you see the two pictures attached to this question. Where did he go? When he comes back, do you know where has he been?