A car transports a pile of goods, and 60% of the total is transported. At this time, there are 20 tons left. How many tons are there in this pile of goods?
一辆汽车运一堆货物，运走了总数的60%，这时剩下20吨，原来这堆货物有多少吨？
<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">20 / (2/5)</gadget>
<output>50</output>

<result>50</result>