A cube glass cylinder with side length 5dm contains water 2dm deep. After putting a stone (the stone is completely submerged in the water), the depth of the water is 2.2dm. What is the volume of this stone in cubic decimeters?
在一个棱长5dm的正方体玻璃缸内盛有2dm深的水．放入一块石头后(石头完全浸入水中)，这时水深2.2dm．这块石头的体积是多少立方分米？
<gadget id="calculator">2.2 - 2</gadget>
<output>0.2</output>

<gadget id="calculator">5 * 5 * 0.2</gadget>
<output>5</output>

<result>5</result>