Percentage of pages of a book read by Katie = 32% Total number of pages of the book read by Katie = 80 Let us assume the number of pages that the book has = x Then (32/100) * x = 80 32x = 80 * 100 32x = 8000 x = 8000/32 = 250 So the book has a total of 250 pages in it. Then The number of pages that Katie still needs to read = 250 - 80 = 170 So Katie needs to read 170 more pages in the book.