Pour 64 liters of water into a cuboid water tank with a length of 8 decimeters, a width of 2.5 decimeters, and a height of 4 decimeters. How many decimeters is the water surface from the mouth of the tank?
把64升水倒入一个长8分米、宽2.5分米、高4分米的长方体水箱内，这时水面距箱口多少分米．
<gadget id="calculator">8 * 2.5</gadget>
<output>20</output>

<gadget id="calculator">64 / 20</gadget>
<output>16/5 = around 3.2</output>

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

<result>4/5 = around 0.8</result>