The students donated books for the class book corner. There are 120 story books. The literature and art books are story books (11/12), and the science and technology books are literature and art books (9/11). How many science and technology books are donated?
同学们为班级图书角捐书，故事书有120本，文艺书是故事书的(11/12)，科技书是文艺书的(9/11)，捐的科技书有多少本？
<gadget id="calculator">11 / 12</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">120 * (11/12) * (9/11)</gadget>
<output>90</output>

<result>90</result>