A cuboid container, measured from the inside, is 2 decimeters in length and width. Pour 8 liters 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 30 cm. The volume of a rock is cubic decimeters.
一个长方体容器，从里面量长宽均为2分米，向容器中倒入8升水，再把一个石头放入水中，这时量得容器内的水深是30厘米．石头的体积是立方分米．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<result>4</result>