Pour 100 liters of water into a tank with a square bottom. The perimeter of the bottom of the tank is 80 cm. What is the height of the water in cm?
把100升水倒入底面是正方形的水箱中，水箱底面周长为80厘米，水面高多少厘米？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">1_000 / 400</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">100 * (5/2)</gadget>
<output>250</output>

<result>250</result>