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 area of the bottom of the iron block is 80 square centimeters. The iron block is completely submerged in the water, and the water level rises by 2 cm, so how many decimeters is the height of this cylindrical iron block?
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，铁块底面积是80平方厘米．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高是多少分米？
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/5) / (4/5)</gadget>
<output>1/4 = around 0.25</output>

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

<result>5</result>