There are 280 story books in the library, and the comic books are from the story books (4/7). How many comic books are there in the library?
图书室有280本故事书，连环画是故事书的(4/7)，图书室有连环画多少本？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">280 * (4/7)</gadget>
<output>160</output>

<result>160</result>