In a cube water tank filled with water with a side length of 20cm (measured from the inside), there is a cuboid iron piece submerged in water, its length is 10cm, and its width is 8cm. When the iron piece is taken out, the water level drops 2cm. What is the height of this iron block?
在一个装满水的棱长为20cm(从里面量)的正方体水缸里，有一块被水浸没了的长方体的铁块，它的长10cm，宽8cm，当把铁块取出后，水位下降了2cm．这块铁块的高是多少？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">2 / 80</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">20 * 20 * (1/40)</gadget>
<output>10</output>

<result>10</result>