Three classes in the sixth grade helped the library to repair books. The first class repaired 54 books, the second class repaired the first class (5/6), and the third class repaired the second class (4/3). How many copies did the third class repair?
六年级3个班帮助图书馆修补图书，一班修补了54本，二班修补的是一班的(5/6)，三班修补的是二班的(4/3)．三班修补了多少本？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">54 * (5/6) * (4/3)</gadget>
<output>60</output>

<result>60</result>