There are two containers of equal height in the laboratory, the radius of the cone container is 9 cm, and the radius of the cylinder container is 6 cm. Now fill the cone container with water and pour it into the cylinder container. At this time, the water depth is 3 cm lower than (6/7) of the container height. What is the height of the two containers in centimeters.
实验室里有两个等高的容器，圆锥体容器的半径为9厘米，圆柱体容器的半径为6厘米．现将圆锥体容器装满水倒入圆柱体容器内，这时水深比容器高度的(6/7)低3厘米．两个容器的高是多少厘米．
<gadget id="calculator">216 / 7</gadget>
<output>216/7 = around 30.857143</output>

<gadget id="calculator">(216/7) - 27</gadget>
<output>27/7 = around 3.857143</output>

<gadget id="calculator">108 / (27/7)</gadget>
<output>28</output>

<result>28</result>