There is a cuboid oil drum, its bottom surface is a square with a side length of 4.5dm, the height of the drum is 6.5dm, and the oil surface is 5cm from the mouth of the drum. How many liters of oil are there in the drum? (The thickness of the barrel is ignored)
有一个长方体油桶，量得它的底面是边长为4.5dm的正方形，桶高6.5dm，油面离桶口5cm，桶里的油有多少升？(油桶的厚度忽略不计)
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6.5 - (1/2)</gadget>
<output>6</output>

<gadget id="calculator">4.5 * 4.5 * 6</gadget>
<output>121.5</output>

<result>121.5</result>