There are 10 different books and 44 different movies in the ' crazy silly school ' series. If you read 7 of the movies and watched 48 of the books How many more books than movies have you read?
There are 44 movies and 10 books. 
You read 7 movies and 48 books. 
That means you read 41 books and watched 37 movies. 

Therefore, you read 4 more books than movies.