A cuboid tank with a length of 20 cm, a width of 15 cm, and a height of 12 cm contains water 8 cm deep. If a stone is submerged in water and the water level rises by 3 cm, what is the volume of the stone?
一个长20厘米，宽15厘米，高12厘米的长方体水箱，里面盛有8厘米深的水．现将一石块浸没于水中后，水面上升了3厘米，石块的体积是多少？
<gadget id="calculator">20 * 15 * 3</gadget>
<output>900</output>

<result>900</result>