There are 800 new story books in the library, which is 80% of the science books. How many science books are there?
图书室新到故事书800本，是科技书的80%，科技书有多少本？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 / (4/5)</gadget>
<output>1_000</output>

<result>1_000</result>