Lele reads a book. She has already read (4/9) of this book, and there are 125 pages left. Does the book have 250 pages? Please explain why.
乐乐看一本书，已经看了这本书的(4/9)，还剩下125页没有看．这本书有250页吗？请说明理由．
<result>250</result>