A cuboid container measures 40cm in length and 20cm in width from the inside. It contains 12cm of water. When an iron ball is fully immersed in the water, the height of the water rises to 16cm. What is the volume of the iron ball in cubic centimeters?
长方体容器从里面量长40cm，宽20cm，里面盛有12cm的水，把一个铁球完全浸入水中后，水的高度上升到16cm，这个铁球的体积是多少立方厘米？
<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">40 * 20 * 4</gadget>
<output>3_200</output>

<result>3_200</result>