When Xiao Ming reads a storybook, he has already read 40% of the whole book, exactly 80 pages. How many pages are there in this storybook?
小明看一本故事书，已经看了全书的40%，正好看了80页，这本故事书共多少页？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<result>200</result>