A cylinder and a cone with equal ground and height have a difference of 12.56 cubic decimeters in volume. What is the volume of the cone in cubic decimeters?
等地等高的圆柱和圆锥，它们的体积相差12.56立方分米，圆锥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">12.56 / (2/3)</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 - 12.56</gadget>
<output>6.28</output>

<result>6.28</result>