cylindrical tin oil barrel, after pouring out (7/10) gasoline, there are 36 liters left. The bottom area of the oil barrel is 12 square decimeters, how many decimeters is the height of the oil barrel?
一个圆柱形铁皮油桶，倒出(7/10)的汽油后，还剩下36升．油桶的底面积是12平方分米，油桶的高是多少分米？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">36 / (3/10)</gadget>
<output>120</output>

<gadget id="calculator">120 / 12</gadget>
<output>10</output>

<result>10</result>