Xiaohong is reading a story book and has read 35 pages, which happens to be (5/7) of this book. How many pages does this book have?
小红读一本故事书，已经读了35页，正好是这本书的(5/7)，这本书一共有多少页？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">35 / (5/7)</gadget>
<output>49</output>

<result>49</result>