To determine who read the most books before Thursday, we will first summarize the total reading for both John and Grady from Sunday to Wednesday.
John's reading:
- Sunday: 1 book
- Monday: 25/50 pages (which can be considered as half a book or 0.5 books)
- Tuesday: 2 books
- Wednesday: 1 book
Total for John:
1 + 0.5 + 2 + 1 = 4.5 books
Grady's reading:
- Sunday: 2 books
- Monday: 1 book
- Tuesday: 40/50 pages (which can also be considered as 0.8 books)
- Wednesday: 2 books
Total for Grady:
2 + 1 + 0.8 + 2 = 5.8 books
Now let's compare:
- John read 4.5 books.
- Grady read 5.8 books.
Therefore, Grady read the most books before Thursday.