Daniel read a total of 6 books over 3 months. After belonging to the book club for 13 months, how many books will Daniel have read in all? Assume the relationship is directly proportional.
books
To find the total number of books Daniel will have read in 13 months, we need to calculate the average number of books he reads per month and then multiply it by the number of months.
The average number of books Daniel reads per month is 6 books / 3 months = 2 books/month.
So, in 13 months, Daniel will have read 2 books/month * 13 months = 26 books. Answer: \boxed{26}.