Students from three classes in the sixth grade helped the library repair books. The first class repaired 54 books, the second class repaired (5/6), and the third class repaired less than the second class (1/5). How many copies did the third class repair?
六年级三个班学生帮助图书室修补图书．一班修补了54本，二班修补的是一班的(5/6)，三班修补的比二班少(1/5)．三班修补了多少本？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">54 * (5/6) * (4/5)</gadget>
<output>36</output>

<result>36</result>