A cuboid water tank can hold 80 liters of water. The bottom surface is a square with side length 4dm. What is the height of the water tank in dm?
一个长方体水箱，能装80升水，底面是边长为4dm的正方形，水箱高多少dm．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">80 / 16</gadget>
<output>5</output>

<result>5</result>