A cube glass container has a side length of 3 decimeters. Pour 8.1 cubic decimeters of water into the container, and then put a stone into the water. At this time, the water depth in the container is measured to be 1.5 decimeters. What is the volume of the stone? rice?
一个正方体玻璃容器棱长为3分米，向容器中倒人8.1立方分米水，再把一块石头放人水中，这时量得容器内的水深为1.5分米，石头的体积是多少立方分米？
<gadget id="calculator">3 * 3 * 1.5</gadget>
<output>13.5</output>

<gadget id="calculator">13.5 - 8.1</gadget>
<output>5.4</output>

<result>5.4</result>