cylinder and a cone have the same base and height, and the sum of their volumes is 36 cubic centimeters, what is the difference between their volumes in cubic centimeters?
一个圆柱和圆锥等底等高，它们的体积和是36立方厘米，它们的体积差是多少立方厘米．
<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>