Pour 48L of water into a cuboid water tank with a length of 5dm, a width of 2.5dm, and a height of 4dm. How much is the water surface in dm from the mouth of the tank?
把48L水倒入一个长5dm，宽2.5dm，高4dm的长方体水箱，这时水面距箱口多少dm．
<gadget id="calculator">2.5 * 5</gadget>
<output>12.5</output>

<gadget id="calculator">48 / 12.5</gadget>
<output>3.84</output>

<gadget id="calculator">4 - 3.84</gadget>
<output>0.16</output>

<result>0.16</result>