Xiao Ming reads a book, reads 12.5% of the whole book on the first day, and reads 12 pages on the second day. At this time, the number of pages that have been read is 1/3 of the number of pages that have not been read. How many pages in this book?
小明看一本书，第一天看了全书的12.5%，第二天看了12页，这时已看页数是未看页数的(1/3)，这本书共多少页？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">(1/4) - 0.125</gadget>
<output>0.125</output>

<gadget id="calculator">12 / 0.125</gadget>
<output>96</output>

<result>96</result>