In 4 hours, Naoya must have read
There were 350 pages remaining at the time, so the total number of pages is
.
For each hour of reading, Naoya reads 55 pages, so the number of pages he's finished reading by the
'th hour is 
. So the number of pages left to read is given by
There were 350 pages remaining at the time, so the total number of pages is
For each hour of reading, Naoya reads 55 pages, so the number of pages he's finished reading by the