Dongdong reads an 80-page story book, and has already read 30 pages, and read the whole book ((())/(())).
东东看一本80页的故事书，已经看了30页，看了全书的((())/(()))．
<gadget id="calculator">30 / 80</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>