There are 70 story books in class 3 and 1, and the number of comic books is 4 times that of story books. How many fewer story books are there than comic books?
三1班有故事书70本，连环画的本数是故事书的4倍，故事书比连环画少多少本？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<result>210</result>