In a glass tank with a length of 80dm and a width of 40dm, a stone is put into it. At this time, the water depth is 30dm. After the stone is taken out, the water depth is 25dm. What is the volume of the stone in cubic decimeters?
在一个长为80dm，宽为40dm的玻璃缸中，放入一石块，这时水深为30dm，取出石块后水深为25dm，这块石块的体积是多少立方分米？
<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<gadget id="calculator">80 * 40 * 5</gadget>
<output>16_000</output>

<result>16_000</result>