There are 480 story books in the school library, and 1/4 of science books are story books. How many science books are there?
学校图书馆有故事书480本，科技书是故事书的(1/4)，科技书有多少本？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">480 * (1/4)</gadget>
<output>120</output>

<result>120</result>