There is some oil in the barrel, and 60% of it is used up, which is exactly 48 kilograms. How many kilograms of oil are there in the barrel?
桶里装有一些油，用去了60%，恰好是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">48 / (3/5)</gadget>
<output>80</output>

<result>80</result>