Pour 45dm**3 of water into a rectangular fish tank with a length of 5dm, a width of 4dm, and a height of 6dm. How much dm is the water surface from the side of the tank?
将45dm**3的水倒入长5dm，宽4dm，高6dm的长方形鱼缸内，水面距缸边还有多少dm．
<gadget id="calculator">5 - 2.25</gadget>
<output>2.75</output>

<result>2.75</result>