There are 30 story books, and the number of comic books is 10% less than that of the story books. How many fewer are the comic books than the story books?
有30本故事书，连环画比故事书少10%，连环画比故事书少多少本．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 * (1/10)</gadget>
<output>3</output>

<result>3</result>