An oil barrel contains some oil, 60% of which is used up, leaving exactly 48 kg. How many kilograms of oil are in the barrel?
一油桶装有一些油，用去了60%，恰好剩下48千克．原来桶里装有多少千克的油．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">48 / (2/5)</gadget>
<output>120</output>

<result>120</result>