A cylinder and a cone have the same base and height, if the sum of their volumes is 108cm**3, what is the difference between their volumes?
一个圆柱和一个圆锥等底等高，如果它们的体积之和是108cm**3，那么它们的体积之差是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">108 / 4</gadget>
<output>27</output>

<gadget id="calculator">108 - 27</gadget>
<output>81</output>

<gadget id="calculator">81 - 27</gadget>
<output>54</output>

<result>54</result>