A cube water tank with a side length of 4 decimeters is filled with water. If this tank of water is poured into another cuboid water tank with a length of 8 decimeters and a width of 2.5 decimeters, what is the depth of the water?
一个棱长4分米的正方体水箱装满水，如果把这箱水倒入另一个长8分米，宽2.5分米的长方体水箱中，水深是多少？
<gadget id="calculator">8 * 2.5</gadget>
<output>20</output>

<gadget id="calculator">4 / 20</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 * 4 * (1/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>