A cylindrical tin oil barrel, filled with gasoline, pour out (2/3) the gasoline in the barrel, and there are 36 liters left. It is known that the height of the oil barrel is 8dm, what is the area of the bottom of the oil barrel in square decimeters?
一个圆柱形铁皮油桶，装满汽油，把桶里的汽油倒出(2/3)，还剩下36升．已知油桶的高为8dm，油桶的底面积是多少平方分米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">36 / (1/3)</gadget>
<output>108</output>

<gadget id="calculator">108 / 8</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>