A cylinder and a cone have the same base. The height of the cylinder is three times the height of the cone. If the volume of the cylinder is 18 cubic centimeters, what is the volume of the cone?
一个圆柱与一个圆锥等底，圆柱的高是圆锥高的3倍，如果圆柱的体积是18立方厘米，圆锥的体积是多少立方厘米．
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