Can you replace the question mark with the correct number?

Replace the question mark with the correct number in below Picture:

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.