cuboid glass tank has a length of 5dm, a width of 4dm, a height of 4dm, and a water depth of 3dm. If a cube of iron with a side length of 2dm is thrown in, how much dm will the water in the tank rise?
一个长方体的玻璃缸，长5dm、宽4dm、高4dm，水深3dm．如果投入一块棱长为2dm的正方体铁块，缸里的水上升多少dm？
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>