Xiaohong reads a book and has already read 55 pages, which happens to be (5/9) of this book. How many pages does this book have?
小红看一本书，已经看了55页，正好是这本书的(5/9)，这本书有多少页？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">55 / (5/9)</gadget>
<output>99</output>

<result>99</result>