A cuboid glass cylinder is 16 decimeters long, 8 decimeters wide, and 7 decimeters high, and the water depth inside is 5 decimeters. If a cube of iron with a side length of 4 decimeters is immersed in it, how many decimeters will the water level rise?
一个长方体玻璃缸，长16分米，宽8分米，高7分米，里面水深5分米，如果在里面浸没一块棱长是4分米的正方体铁块，水面上升多少分米？
<gadget id="calculator">16 * 8</gadget>
<output>128</output>

<gadget id="calculator">4 / 128</gadget>
<output>1/32 = around 0.03125</output>

<gadget id="calculator">4 * 4 * (1/32)</gadget>
<output>1/2 = around 0.5</output>

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