A cylinder and a cone have the same base and height, and the height of the cylinder is increased by 4 times. When the area of the base of the cone remains the same, how many times should the height of the cone be increased to make the volume of the cone equal to that of the cylinder?
一个圆柱和一个圆锥等底等高，把圆柱的高扩大4倍，当圆锥的底面积不变，要使圆锥的体积和圆柱的相等，圆锥的高应该扩大多少倍．
<result>12</result>