A cubic tank with a side length of 3 decimeters is filled with half a tank of water. Now a stone is completely submerged in the water and the water surface rises by 6 cm. What is the volume of the stone?
在一个棱长3分米的立方体水箱中装有半箱水，现把一块石头完全浸没在水中水面上升6厘米，这块石头的体积是多少？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 * 30 * 6</gadget>
<output>5_400</output>

<result>5_400</result>