Additional question: Xiaoliang read a story book, read the whole book (1/5) on the first day, read 6 pages more than the first day on the second day, and the number of pages already read at this time is the number of remaining pages ( 9/11), how many pages are there in this storybook?
附加题：小亮读一本故事书，第一天读了全书的(1/5)，第二天比第一天多读6页，这时已经读的页数是剩下页数的(9/11)，这本故事书一共有多少页？
<gadget id="calculator">11 + 9</gadget>
<output>20</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">(9/20) - (1/5) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">6 / (1/20)</gadget>
<output>120</output>

<result>120</result>