The bookstore shipped a batch of books, 40% of which were sold on the first day. If they sold 45 more books on the second day than the first day, all of them could be sold out. How many books are there in this batch?
书店运来一批图书，第一天售出40%，如果第二天比第一天多卖45本就可全部卖完，这批书共有多少本？
<result>255</result>