cuboid iron water tank with a square bottom, if you expand its sides, you can get a square with a side length of 40 cm. How many liters of water can this tank hold? (Iron sheet thickness is ignored)
一个底面是正方形的长方体铁皮水箱，如果把它的侧面展开，正好可以得到一个边长是40厘米的正方形．这个水箱最多能盛水多少升？(铁皮厚度忽略不计)
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">10 * 10 * (1/25)</gadget>
<output>4</output>

<result>4</result>