40% of the book corners in the class are story books, and the rest are comic books. There are 30 comic books. How many books are there in the book corner? what is the correct formula
班级图书角中40%是故事书，其余都是漫画书，漫画书有30本，图书角共有图书多少本？正确的算式是多少
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 / (3/5)</gadget>
<output>50</output>

<result>50</result>