A cuboid fish tank, the bottom surface is a square with a circumference of 60 cm, pour 9 liters of water into the fish tank, how many centimeters is the water in the fish tank?
一个长方体鱼缸，底面是一个周长60厘米的正方形，向鱼缸内倒入9升水，鱼缸内水高几厘米？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">1_000 / 225</gadget>
<output>40/9 = around 4.444444</output>

<gadget id="calculator">9 * (40/9)</gadget>
<output>40</output>

<result>40</result>