A cube glass fish tank, the side length of the bottom surface is 3dm, the water level rises by 0.3dm after a stone is put in, what is the volume of the stone?
一个正方体玻璃鱼缸，底面边长为3dm，放入一块石头后水面升高了0.3dm，这块石头的体积是多少．
<gadget id="calculator">3 * 3 * 0.3</gadget>
<output>2.7</output>

<result>2.7</result>