rectangular parallelepiped sink measures 50 cm long and 40 cm wide from the inside, pours 40 liters of water, what is the depth of the water in cm?
一个长方体水槽，从里面量长50厘米，宽40厘米，倒入40升的水，水深多少厘米．
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">1_000 / 2_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 * 1 * (1/2)</gadget>
<output>20</output>

<result>20</result>