There is a pile of coal, 60% of the total amount is used up, and then 24 tons are transported in. At this time, the amount of coal in this pile is exactly (2/3) of the original total amount, so how many tons is the original total amount of this pile of coal?
有一堆煤，用掉总量的60%后又运进24吨，这时这堆煤量正好是原来总量的(2/3)，那么这堆煤原有总量是多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<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">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">24 / (4/15)</gadget>
<output>90</output>

<result>90</result>