A cylinder of steel with a height of 60 cm can be melted and cast into how many cones of steel with the same area as the bottom of the cylinder and a height of 10 cm.
一个圆柱体钢材，高60cm，可以熔铸成多少个和这个圆柱体底面积相等，高10cm的圆锥体钢材．
<result>18</result>