A cylinder and a cone with the same base and height, the difference between their volumes is 18 cubic centimeters, what is the sum of their volumes in cubic centimeters?
等底等高的圆柱和圆锥，它们的体积之差是18立方厘米，它们的体积之和是多少立方厘米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<result>36</result>