A cuboid tank measures 60cm in length and 40cm in width from the inside, and the depth of water in the tank is 20cm. A stone was immersed in the water. When the stone is taken out and the water depth is 15 cm, what is the volume of the stone in cubic centimeters?
一个长方体水槽，从里面量长60cm，宽40cm，现在水槽里的水深20cm．水中浸有一块石头．当把石头取出后，水深为15cm，这块石头的体积是多少立方厘米？
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">60 * 40 * 5</gadget>
<output>12_000</output>

<result>12_000</result>