A cylinder and a cone have the same base and height, and the sum of their volumes is 36d㎡. By how much d㎥ is the volume of the cone smaller than the volume of the cylinder?
一个圆柱和一个圆锥等底等高，体积之和是36d㎡．圆锥体积比圆柱体积少多少d㎥．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>