A cuboid oil drum is 50 cm high and the bottom is a square with a side length of 25 cm. The height of the oil contained in the drum is 40 cm. How many liters of oil does this oil drum hold?
一个长方体油桶，高50厘米，底面是边长为25厘米的正方形，桶内盛有油的高度是40厘米，这个油桶盛了多少升油？
<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

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

<result>25</result>