A cuboid glass fish tank is 8 decimeters long and 5 decimeters wide. After putting an irregular stone in, the water depth is 3.7 decimeters. After removing the stone, the water level drops by 0.3 decimeters. What is the volume of this stone.
有一长方体的玻璃鱼缸，长是8分米，宽是5分米．放入一块不规则的石头后水深3.7分米，捞出这块石头后，水面下降0.3分米．这块石头的体积是多少．
<gadget id="calculator">8 * 5 * 0.3</gadget>
<output>12</output>

<result>12</result>