A pile of coal, after burning 40% of the total amount, is transported in 24 tons. At this time, the tonnage of coal stored is 2/3 of the original total amount. How many tons does this pile of coal originally have?
一堆煤，烧掉了总数的40%后，又运进24吨，这时存煤吨数是原来总数的(2/3)，这堆煤原来有多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<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">(2/3) - (3/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">24 / (1/15)</gadget>
<output>360</output>

<result>360</result>