For a pile of coal, 80 tons were transported away for the first time, and the ratio of what was transported away for the second time to the remaining after two transports was 5:3, and the total tonnage was transported for the second time (5/12). How many tons is this pile of coal?
一堆煤，第一次运走80吨，第二次运走的与运了两次后剩下的比是5：3，第二次运走总吨数的(5/12)．这堆煤共多少吨？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/12) * (3/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (5/12) - (1/4)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">80 / (1/3)</gadget>
<output>240</output>

<result>240</result>