A barrel of oil is poured out (1/3), and there is 36kg left. How much is the barrel of oil originally?
一桶油倒出(1/3)，还剩36㎏，这桶油原来有多少㎏．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">36 / (2/3)</gadget>
<output>54</output>

<result>54</result>