A cube container with a side length of 5 decimeters, after pouring water into it, the water surface rises to 3 decimeters, and after putting a stone, the water surface rises to 3.6 decimeters. Find the volume of the stone.
一个棱长5分米的正方体容器，里面注入水后，水面升至3分米处，放入一个石块后，水面上升到3.6分米．求石块的体积．
<gadget id="calculator">3.6 - 3</gadget>
<output>0.6</output>

<gadget id="calculator">5 * 5 * 0.6</gadget>
<output>15</output>

<result>15</result>