Ariel read a total of 28 books over 4 months. After belonging to the book club for 7 months, how many books will Ariel have read in all? Solve using unit rates.
Ariel reads 28 books in 4 months.
To find how many books she reads in 1 month, divide 28 books by 4 months: 28 books / 4 months = <<28/4=7>>7 books/month.
After 7 months, Ariel will have read 7 books/month * 7 months = <<7*7=49>>49 books. Answer: \boxed{49}.