A cylinder and a cone have the same base and height, the sum of their volumes is 36cm**3, what is the difference between their volumes?
一个圆柱和一个圆锥等底等高，它们的体积之和是36cm**3，它们的体积之差是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">27 - 9</gadget>
<output>18</output>

<result>18</result>