In a tank whose base is 20 cm long and 15 cm wide, the height of the water surface is 8 cm. A block of iron is completely submerged in water, and the water surface rises to 12 cm, what is the volume of the block of iron?
在一个底面长为20厘米，宽15厘米的水箱中，水面的高度是8厘米．把一块铁块完全浸没在水中，水面上升到12厘米，这块铁块的体积是多少？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">20 * 15 * 4</gadget>
<output>1_200</output>

<result>1_200</result>