A cylindrical tin oil drum is full of gasoline. If there is 56L left after pouring out (3/10), the height of the oil drum is 8dm, how many square decimeters does it occupy?
一个圆柱形铁皮油桶装满了汽油，如果将倒出(3/10)后还剩56L，油桶的高是8dm，它的占地面积是多少平方分米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">56 / (7/10)</gadget>
<output>80</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<result>10</result>