An irregular stone is thrown into a cuboid container with a base area of 20 square decimeters, a height of 5 decimeters, and a water depth of 2 decimeters. The water level rises by 0.5 decimeters. What is the volume of this stone in cubic decimeters?
把一块不规则的石头投进一个底面积为20平方分米，高5分米，水深2分米的长方体容器里．水面上升0.5分米．这块石头的体积是多少立方分米？
<gadget id="calculator">20 * 0.5</gadget>
<output>10</output>

<result>10</result>