Mikey is reading a 415-page book. Today he started reading on page 15; he had started reading last week. If he reads for x hours
at 20 pages per hour, which equation represents how long it will take him to finish the book?
You would do this because Miley has a total of 415 pages. You would put the +15 because he already read 15 pages. Now he constantly reads 20 pages per hour which can be represented by 20x.