The volume of a cylinder is 15 cubic decimeters. The area of the base of a cone is equal to the area of the base of the cylinder. The height of the cone is 6 times the height of the cylinder. What is the volume of the cone?
一个圆柱的体积是15立方分米，一个圆锥的底面积与这个圆柱的底面积相等，圆锥的高是圆柱高的6倍，圆锥的体积是多少立方分米．
<result>30</result>