cuboid fish tank is 5 decimeters long, 3 decimeters wide, 2.5 decimeters high, and 2 decimeters deep. Now, a stone is completely immersed in water, and the water surface rises to 2.3 decimeters, what is the volume of the stone?
一个长方体的鱼缸，长5分米，宽3分米，高2.5分米，水深2分米．现、将一块石头完成浸入水中，水面上升到2.3分米，求石头的体积？
<gadget id="calculator">2.3 - 2</gadget>
<output>0.3</output>

<gadget id="calculator">5 * 3 * 0.3</gadget>
<output>4.5</output>

<result>4.5</result>