cubic water tank, measured from the inside, has a side length of 2 decimeters. Add 5 liters of water into the tank. When a stone is put into the tank, the water depth is 1.5 decimeters. What is the volume of this rock?
一个正方体水箱，从里面量是棱长为2分米，向容器中加入5升的水，当把一块石块放入水箱后，水深1.5分米．这块石块的体积是多少？
<gadget id="calculator">2 * 2 * 1.5</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>