Published And Unpublished Sources

What is the averge number of non-academic books published by publisher R and S ?

If the total number of boks published P,Q and R is increased by 30% and the total number of books pyblished by remaining publishers be decreases by 20% what will be the new average of books published by all the publishers ?

How many books were given to each distributor by publisher Q if each publisher gets equal number of books ?

The ratio of the number of books publisyhed by publishers P and Q is