A cylindrical oil barrel is full of oil, pour out (2/5) the oil in the barrel, there are 20 liters left, the height of the oil barrel is 8 decimeters, what is the area of the bottom of the oil barrel in square decimeters?
一个圆柱形油桶，装满了油，把桶里的油倒出(2/5)，还剩20升，油桶高8分米，油桶的底面积是多少平方分米？
<gadget id="calculator">25 / 12</gadget>
<output>25/12 = around 2.083333</output>

<result>25/12 = around 2.083333</result>