There is a cube container with a side length of 4 decimeters, filled with 3 decimeters of water, if a cube iron block with a side length of 2 decimeters is put into the water, how many decimeters will the water level rise?
有一个正方体容器，棱长为4分米，里面注有3分米深的水，如果把一块棱长为2分米的正方体铁块放入水中，那么水面上升了多少分米？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">2 / 16</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2 * 2 * (1/8)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>