Answer: The book has 570 pages
Step-by-step explanation: In the question each number is repeated 3 times, so the actual question would be:
Naoya read a book cover to cover in a single session, at a rate of 55 pages per hour. After 4 hours, he had 350 pages left to read.
In this case, you may want to find the total number of pages in the book.
The total number of pages is:
N = Numer of pages read + Numbers of pages left
Where the number of pages left is 350 pages
And the number of pages read is equal to 55*4 (because in each hour she reads 55 pages, so in 4 hours she reads 4 times that amount)
N = 4*55 + 350 = 220 + 350 = 570 pages
