barrel of oil is poured out (5/6), exactly 15 kilograms are poured out, what is the original weight of the barrel of oil in kilograms?
一桶油倒出(5/6)，刚好倒出15千克，这桶油原来重多少千克．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">15 / (5/6)</gadget>
<output>18</output>

<result>18</result>