Xiao Ming read a story book, read 18% of the whole book on the first day, 30% of the whole book on the second day, and read 30 pages more on the second day than on the first day. How many pages does this book have? (Solved by the method of column equation)
小明读一本故事书，第一天读了全书的18%，第二天读了全书的30%，第二天比第一天多读了30页．这本书一共有多少页？(用列方程的方法解答)
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">30 / (3/25)</gadget>
<output>250</output>

<result>250</result>