There are 400 story books in the school library, the number of comic books is storybook (5/8), and the number of composition books is comic book (7/10), how many composition books are there in the school library?
学校图书室有故事书400本，连环画的本数是故事书的(5/8)，作文书的本数是连环画的(7/10)，学校图书室有多少本作文书？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">400 * (5/8) * (7/10)</gadget>
<output>175</output>

<result>175</result>