There are 80 story books in the library of class 61, the composition books are story books (3/4), and the science books are composition books (4/5), how many science books are there?
六1班图书馆有故事书80本，作文书是故事书的(3/4)，科技书是作文书的(4/5)，科技书有多少本？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 * (3/4) * (4/5)</gadget>
<output>48</output>

<result>48</result>