Xiao Ming read 20% of the whole book on the first day, 25% more on the second day than on the first day, and 12 pages on the third day, exactly half of the book and 2 more pages. How many pages does this book have?
小明读一本书第一天读了全书的20%，第二天比第一天多读了25%，第三天又读了12页，正好读了全书的一半多2页．这本书共有多少页？
<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/5) * (5/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(1/2) - (9/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">10 / (1/20)</gadget>
<output>200</output>

<result>200</result>