There are 800 story books in the bookstore, comic books are story books (5/8), technology books are comic books (7/50), how many technology books are there?
书店有故事书800本，漫画书是故事书的(5/8)，科技书是漫画书的(7/50)，科技书有多少本？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">7 / 50</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">800 * (5/8) * (7/50)</gadget>
<output>70</output>

<result>70</result>