40% of a batch of goods has been shipped, and there are 24 tons left. How many tons of this batch of goods used to be?
一批货物，已运出40%，还剩24吨，这批货物原来多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">24 / (3/5)</gadget>
<output>40</output>

<result>40</result>