cylinder and a cone with the same base and height have a difference of 18 cubic decimeters in volume. What is the volume of the cone in cubic decimeters?
等底等高的一个圆柱体和一个圆锥体，它们的体积相差18立方分米，这个圆锥体的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 / (2/3)</gadget>
<output>27</output>

<gadget id="calculator">27 * (1/3)</gadget>
<output>9</output>

<result>9</result>