A cylinder is cut into a cone with the largest volume, and the cut volume is 12.4cm**3. What is the original volume of the cylinder in cm**3?
一个圆柱体削成一个体积最大的圆锥体，削去的体积是12.4cm**3，这个圆柱原来的体积是多少cm**3．
<gadget id="calculator">12.4 / 2</gadget>
<output>6.2</output>

<gadget id="calculator">6.2 * 3</gadget>
<output>18.6</output>

<result>18.6</result>