The height of water in a cube glass container with side length 20 cm is 12 cm. Now put a piece of square steel into the container, the square steel sinks into the water, and the height of the water rises to 15 cm. What is the volume of this square bar in cubic centimeters?
一个棱长是20厘米的正方体玻璃容器中，水的高度是12厘米．现在往容器中放入一块方钢，方钢沉没水中，水的高度上升到15厘米．这块方钢的体积是多少立方厘米？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">20 * 20 * 3</gadget>
<output>1_200</output>

<result>1_200</result>