Put a stone in a glass jar with a length of 80 cm and a width of 40 cm. The stone is submerged in water. At this time, the water depth is 30 cm. After the stone is taken out, the water depth is 25 cm. What is the volume of the stone?
在一个长80厘米，宽40厘米的玻璃缸中放入一个石块，石块浸没于水中，这时水深30厘米，取出石块后水深25厘米，石块的体积是多少？
<gadget id="calculator">30 - 25</gadget>
<output>5</output>

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

<result>16_000</result>