Xiaohua has 120 extracurricular books, the number of Xiaoping's extracurricular books is Xiaohua's (4/5), and Xiaolan's extracurricular books are Xiaoping's (3/4). How many extracurricular books does Xiaolan have?
小华有课外书120本，小平课外书的本数是小华的(4/5)，小兰课外书的本数是小平的(3/4)．小兰有课外书多少本？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (4/5) * (3/4)</gadget>
<output>72</output>

<result>72</result>