A cuboid fish tank measures 90 cm long, 50 cm wide, and 50 cm deep from the inside. Pour 6 passes of water into the empty bathtub, 9 liters per barrel. How deep is the water in the fish tank in centimeters?
一个长方体的鱼缸，从里面量长90厘米，宽50厘米，深50厘米，往空浴缸里倒进6通水，每桶9升，鱼缸里水深多少厘米？
<gadget id="calculator">90 * 50</gadget>
<output>4_500</output>

<gadget id="calculator">1_000 / 4_500</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">9 * 6 * (2/9)</gadget>
<output>12</output>

<result>12</result>