Danish read 15 pages of a book in a day. Wesley read 20 pages of the same book in a day. Danish started reading the book 3 days earlier than Wesley. How many days would Wesley need to read the book to be 20 pages ahead of Danish?

Answer 1

In one day, Wesley reads 20 - 15 = <<20-15=5>>5 pages more than Danish.
Wesley needs to read 20 pages / 5 pages/day = <<20/5=4>>4 days to be 20 pages ahead. Answer: \boxed{4}.