A cuboid container with a length of 5 decimeters and a width of 4 decimeters is filled with water with a depth of 10 centimeters. Now put a cylindrical iron block in it. The iron block is completely immersed in the water, and the water level rises by 2 centimeters. Then What is the volume of this cylindrical iron block in cubic decimeters?
一个从里面量长5分米，宽4分米的长方体容器中，装了深10厘米的水，现在里面放入一个圆柱体的铁块，铁块完全浸入水中，水面上升了2厘米，那么这个圆柱形铁块的体积是多少立方分米？
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 * 4 * (1/5)</gadget>
<output>4</output>

<result>4</result>