cube glass fish tank is filled with a certain amount of water. The length of the bottom side is 3dm. After a stone is completely submerged in the water, the water level rises by 0.3dm. What is the volume of the stone in cubic decimeters?
一个正方体玻璃鱼缸装有一定量的水，底面边长为3dm，把一块石头完全浸没在水中后，水面升高了0.3dm，这块石头的体积是多少立方分米．
<gadget id="calculator">3 * 3 * 0.3</gadget>
<output>2.7</output>

<result>2.7</result>