Put a stone in a cuboid glass tank, the water surface is 6 cm high before it is put in, and the water surface is 10 cm high after it is put in. At this time, the stone is completely submerged in the water. The inside of the tank is 30 cm long and 20 cm wide, find the volume of the stone.
在长方体玻璃缸中放入一石块，放入前水面高6厘米，放入后水面高10厘米，这时石块全浸没在水中．缸里面长30厘米，宽20厘米，求石块体积．
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">30 * 20 * 4</gadget>
<output>2_400</output>

<result>2_400</result>