Stephanie is reading a 456-page book. During the past 7 days she has read 168 pages. If she continues reading at the same rate, how many more days will it take to complete the book?

It is 24 pages per day. I hope it is correct.

It should be twelve more days. If she read 168 pages in seven days that's twenty four pages a day, and if you divide 456 by twenty four, that equals nineteen. Just subtract seven from nineteen and you have twelve.