bài vừa nãy mình gửi lỗi đây nha ----- Nội dung dịch tự động từ ảnh ----- There are two boxes of books, the first box has 42 books. If 15 books are removed from the first box, the number of books in the second box will be twice as many as the number of books in the first box. How many books are in both boxes?
