The number of story books in the class book corner is 80% of the number of popular science books. After buying 16 story books, there are as many story books as popular science books. How many popular science books are there in the class book corner?
班级图书角的故事书本数是科普书本数的80%，买来16本故事书后，故事书和科普书一样多，班级图书角有科普书有多少本？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">16 / (1/5)</gadget>
<output>80</output>

<result>80</result>