Can you fill the blank with the correct number?

6 30 870 756030 _____

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Find the number of squares in the below-given picture.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

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.

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?