Xiao Ming reads a story book, and has already read (2/3) of the whole book, which is exactly 80 pages. How many pages are there in the whole book?
小明看一本故事书，已经看了全书的(2/3)，正好是80页，全书有多少页？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 / (2/5)</gadget>
<output>200</output>

<result>200</result>