There are 270 story books in the school library, and the books of science and technology are story books (7/10). How many books of science and technology are there?
学校图书室有故事书270本，科技书的本书是故事书的(7/10)，科技术有多少本？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">270 * (7/10)</gadget>
<output>189</output>

<result>189</result>