A cuboid glass fish tank is 50 cm long, 40 cm wide, and 30 cm high. Fill the fish tank with 36 liters of water, how many centimeters is the water depth? (Glass thickness is not counted)
一个长方体玻璃鱼缸，长50厘米，宽40厘米，高30厘米．在鱼缸里注满36升水，水深大约多少厘米？(玻璃厚度不计)
<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">36 * (1/2)</gadget>
<output>18</output>

<result>18</result>