A cuboid tank is 8 decimeters long, 5 decimeters wide, and 10 decimeters high. It contains 3 decimeters of water. Now, if an iron block with a side length of 4 decimeters is sunk in water, how many decimeters will the water surface rise to?
一个长方体水缸长8分米，宽5分米，高10分米．里面装着3分米深的水．现在将一个棱长4分米的铁块沉没在水中，水面会上升到多少分米？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">4 / 40</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4 * 4 * (1/10)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">3 + (8/5)</gadget>
<output>23/5 = around 4.6</output>

<result>23/5 = around 4.6</result>