Answer: There are 550 pages in the book
Step-by-step explanation:
Since we have given that
Number of pages per hour Naoya read = 55
Number of hours he read the book = 4
Total number of pages he read is given by

Still there are some pages are left ,
Number of pages left = 330
So, total number of pages in the book is given by

Hence, there are 550 pages in the book .