Xiaoye reads a story book, and has already read it (4/7), and it happens to read 52 pages. How many pages does this book have?
小叶看一本故事书，已经看了(4/7)，正好看了52页，这本书一共有多少页．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">52 / (4/7)</gadget>
<output>91</output>

<result>91</result>