Cut a cylinder into the largest cone. The volume of the cut cone is 12 cubic decimeters. If the base area of the cylinder is 4 square decimeters, what is the height of the cylinder in decimeters?
把一个圆柱体削成一个最大的圆锥体，削成的圆锥体的体积是12立方分米，如果圆柱的底面积是4平方分米，那么圆柱体的高是多少分米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<result>9</result>