Millie read a 36-page book and a 54-page book. she read the books in 5 days. she read the same number of pages every day. how many pages did millie read each day?

The answer is 18 pages per day. If you add 36 and 54 you get 90. Since she reads the same everyday over 5 days you can set up equation 5x = 90. Divide each side by 5 yields x = 18. To check, it takes 2 days to read 36 pages and 3 days to read 54 pages for a total of 5 days at 18 pages per day.