A cylindrical tin oil barrel, after filling it with gasoline, pour out (2/3) of the gasoline in the barrel, and there are 18 liters left. It is known that the height of the oil barrel is 8 decimeters, and the bottom area of the oil barrel is how many square meters decimeter?
一个圆柱形铁皮油桶，装满汽油后，把桶里的汽油倒掉(2/3)，还剩下18升，已知油桶的高是8分米，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">18 / (1/3)</gadget>
<output>54</output>

<gadget id="calculator">54 / 8</gadget>
<output>27/4 = around 6.75</output>

<result>27/4 = around 6.75</result>