have read 39 pages of a book and finished it in the remaining 8 days. If the number of pages I read every day is equal, and I read the whole book in 3 days (5/22), how many pages does this book have?
一本书，已经看了39页，剩下的8天看完，如果每天看的页数相等，3天看了恰好是全书的(5/22)，这本书共有多少页？
<gadget id="calculator">5 / 22</gadget>
<output>5/22 = around 0.227273</output>

<gadget id="calculator">(5/22) / 3</gadget>
<output>5/66 = around 0.075758</output>

<gadget id="calculator">(5/66) * 8</gadget>
<output>20/33 = around 0.606061</output>

<gadget id="calculator">1 - (20/33)</gadget>
<output>13/33 = around 0.393939</output>

<gadget id="calculator">39 / (13/33)</gadget>
<output>99</output>

<result>99</result>