There is a cuboid glass tank with a length of 3 decimeters and a width of 2 decimeters. After an irregular stone is put into the water, the depth of the water is 1.5 decimeters. After the stone is removed, the water level drops by 0.5 decimeters. What is the volume of this stone?
有一个长方体玻璃缸，长3分米，宽2分米，放入一块不规则的石头后水深1.5分米，捞出石头后，水面下降了0.5分米．这块石头的体积是多少？
<gadget id="calculator">3 * 2 * 0.5</gadget>
<output>3</output>

<result>3</result>