A cylinder and a cone have the same base diameter, the height of the cone is three times that of the cylinder, and the volume of the cone is 12 cubic decimeters. What is the volume of the cylinder?
一个圆柱和一个圆锥的底面直径相等，圆锥的高是圆柱的3倍，圆锥的体积是12立方分米，圆柱的体积是多少立方分米．
<result>12</result>