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.
13. If Molly rides twelve miles and there is a marker at each mile, that means that she would have passed 12 markers if she passed one at the end of each mile. However, since there are markers at the start and end, there are 13 markers.