Jerry had 48 action figures and 22 books on a shelf in his room. Later he added 50 more books to the shelf. How many books were on his shelf in all?
Jerry had 48 action figures and 22 books on a shelf in his room. 

This means that there were a total of 70 items on the shelf. 

Later, he added 50 more books to the shelf. 

This means that there are now a total of 120 items on the shelf. 

Of those 120 items, 50 are books. Therefore, there are a total of 50 books on the shelf.