Xiaojun reads a story book and reads 25 pages a day. After reading for 5 days, he reads 5 pages and reads exactly half of the book. How many pages does this book have?
小军看一本故事书，每天看25页，看了5天后，再看5页就正好看了这本书的一半．这本书有多少页？
<gadget id="calculator">25 * 5</gadget>
<output>125</output>

<gadget id="calculator">125 + 5</gadget>
<output>130</output>

<gadget id="calculator">130 * 2</gadget>
<output>260</output>

<result>260</result>