classmate reads a famous book in the world. He reads (1/10) of the whole book on the first day, and then reads (1/9), (1/8), and (1/7) of the existing pages of that day in the next eight days. , (1/6), (1/5), (1/4), (1/3), (1/2), and there are 23 pages left after reading for nine days, how many pages did the student read in nine days?
某同学读一本世界名著，第一天读了全书的(1/10)，以后八天分别读该天现有页数的(1/9)、(1/8)、(1/7)、(1/6)、(1/5)、(1/4)、(1/3)、(1/2)，读了九天还剩23页，则该同学九天一共读了多少页．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(9/10) * (1/9) * 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * (1/8) * 8</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) * (1/2) * 9</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">23 / (1/10)</gadget>
<output>230</output>

<gadget id="calculator">230 - 23</gadget>
<output>207</output>

<result>207</result>