Xiaohong reads a story book and reads 50 pages, which happens to be (1/4) of the whole book. How many pages does this book have?
小红读一本故事书，读了50页，正好读了全书的(1/4)．这本书共有多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<result>200</result>