A square glass container with a side length of 2 decimeters, pour 5 liters of water into the container, and then submerge a stone in the water. At this time, the depth of the water in the container is measured to be 18 cm. What is the volume of the stone in cubic decimeters?
一个正方体的玻璃容器棱长2分米，向容器中倒入5升水，再把一块石头浸没在水中，这时量得容器中的水深18厘米，石头的体积是多少立方分米？
<gadget id="calculator">18 / 10</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">2 * 2 * (9/5)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">(36/5) - 5</gadget>
<output>11/5 = around 2.2</output>

<result>11/5 = around 2.2</result>