There is a cuboid glass tank with a length of 25 cm and a width of 8 cm. After putting an irregular stone, the water rises from 15 cm to 36 cm. What is the volume of this stone?
有一个长方体玻璃缸，长25厘米，宽8厘米，放入一块不规则的石头后，水由15厘米上升到36厘米，这块石头的体积是多少？
<gadget id="calculator">36 - 15</gadget>
<output>21</output>

<gadget id="calculator">25 * 8 * 21</gadget>
<output>4_200</output>

<result>4_200</result>