There are 400 story books in the school library, the comic books are story books (5/8), and the composition books are comic books (3/5). How many composition books are there?
学校图书室有故事书400本，连环画是故事书的(5/8)，作文书是连环画的(3/5)，作文书有多少本．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">400 * (5/8) * (3/5)</gadget>
<output>150</output>

<result>150</result>