A pile of coal, after transporting 40% of the remaining 24 tons, how many tons does this pile of coal have?
一堆煤，运走了40%后剩24吨，这堆煤原有多少吨．
<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>