Li Li reads a story book. He reads (1/8) of this book on the first day and (1/5) of this book on the second day. It is known that he reads more on the second day than on the first day. 9 pages of the book, so which page should I read on the third day?
李丽看一本故事书，他第一天读了这本书的(1/8)，第二天读了这本书的(1/5)，已知第二天比第一天多读9页书，那么第三天应从第几页看起？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/5) - (1/8)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">9 / (3/40)</gadget>
<output>120</output>

<gadget id="calculator">(1/5) + (1/8)</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">120 * (13/40)</gadget>
<output>39</output>

<gadget id="calculator">39 + 1</gadget>
<output>40</output>

<result>40</result>