How many times can you subtract the number two from the number fifty?

How can one talk without saying a single word?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

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

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?