A cuboid iron bucket has a volume of 64 liters and a bottom surface of a square with a perimeter of 16 decimeters. If (4/5) of water is filled into the bucket, how many decimeters is the water surface high?
一个长方体铁桶，它的容积是64升，底面是周长16分米的正方形，如果往桶里装(4/5)的水，水面高多少分米？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">64 / 16</gadget>
<output>4</output>

<gadget id="calculator">16 / 4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

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