Three classes in the fifth grade helped the library to repair books. The first class repaired 54 books, the second class repaired the number of books (5/6), and the third class repaired the number of books (3/5). How many books are repaired by the third class?
五年级三个班帮助图书室修补图书，一班修补了54本，二班修补的本数是一班的(5/6)，三班修补的本数是二班的(3/5)．三班修补图书多少本？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">54 * (5/6) * (3/5)</gadget>
<output>27</output>

<result>27</result>