If a cube of iron with a side length of 2 decimeters is completely submerged in a cuboid glass container with a length of 40 cm and a width of 25 cm, how many decimeters will the water level rise? (Water will not overflow)
把一个棱长是2分米的正方体铁块完全浸没在一个长40厘米、宽25厘米的长方体玻璃容器里，水面会升高多少分米．(水不会溢出)
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 * 2 * (1/5)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>