Xiaoqiang reads a story book. He read 12% of the whole book on the first day and 16% of the whole book on the second day. He read 2 pages less on the first day than on the second day. How many pages does this book have?
小强读一本故事书，第一天读了全书的12%，第二天读了全书的16%，第一天比第二天少读了2页，这本书有多少页？
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">(4/25) - (3/25)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">2 / (1/25)</gadget>
<output>50</output>

<result>50</result>