Xiaoyu read 25% of the book "Rambling Mathematics" in the first week of summer vacation, and (1/3) read this book in the second week, and read 15 pages more in the second week than in the first week. How many pages are there?
小羽在暑假第一周阅读了《漫话数学》这本书的25%，在第二周阅读这本书的(1/3)，第二周比第一周多读了15页，这本书共有几页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">15 / (1/12)</gadget>
<output>180</output>

<result>180</result>