Melt and cast a cuboid iron block with a side length of 8 decimeters into a cuboid iron block with a length of 10 decimeters and a width of 4 decimeters. What is the height of this cuboid iron block?
把一个棱长是8分米的正方体铁块熔铸成一个长10分米，宽4分米的长方体铁块，这个长方体铁块的高是多少分米？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">8 / 40</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 * 8 * (1/5)</gadget>
<output>64/5 = around 12.8</output>

<result>64/5 = around 12.8</result>