Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

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

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

What does this simple rebus mean?

There was a strange boy who was born before his father. How can this be possible?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A California farmer owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner calls the farmer to see how much fruit is available for him to buy. The farmer knows the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?

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?