The edge length of a cube glass container is 2 decimeters. Pour 4 liters of water into the container, and then put a stone into the water. At this time, the water depth in the container is 15 cm. What is the volume of the stone?
一个正方体玻璃容器的棱长为2分米，向容器中倒入4升水，再把一块石头放入水中，这时容器内的水深15厘米，求石块的体积是多少？
<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2 * 2 * (3/2)</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>