My brother has four times as many books as my brother.
The total remains the same ***30. Let's push back from behind. It says that my brother has four times as many books as my brother, so my brother has one book and my brother has four books and five books. 30? 5=6. One copy is 6. My brother later had six books, so my brother originally had 1 1 books, so my brother had 19 books.