There are 30 story books, the number of comic books is less than the story book (1/6), how many fewer comic books than the story books.
有30本故事书，连环画比故事书少(1/6)，连环画比故事书少多少本．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<result>5</result>