Xiaohua reads a book, plans to finish it in 10 days, actually finishes it in 8 days, and reads 2 pages more than planned every day, how many pages does this book have?
小华读一本书，计划10天读完，实际8天读完，每天比计划多读2页，这本书共有多少页？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">2 / (1/40)</gadget>
<output>80</output>

<result>80</result>