A cuboid oil barrel is 56 cm high and the bottom is a square with a side length of 30 cm. The height of the oil contained in the barrel is 50 cm. How many liters of oil does this oil barrel hold?
一个长方体油桶，高56厘米，底面是边长为30厘米的正方形，桶内盛有油的高度是50厘米，这个油桶盛了多少升油？
<gadget id="calculator">50 / 1_000</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">30 * 30 * (1/20)</gadget>
<output>45</output>

<result>45</result>