Xiaoli reads a story book, and has already read (2/5) of the whole book, and just read page 120 of this book. How many pages does this book have?
小丽看一本故事书，已经看了全书的(2/5)，正好看了这本书的120页．这本书有多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>