what does the below rebus means?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

What question can you never answer yes to?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

Solve below rebus puzzle?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

By what process could you make a 'Tea-Table' into food?