There is a pile of coal, all of which (2/5) is removed on the first day, and 2 tons more than on the first day are removed on the second day, and there are still 12 tons left. How many tons is this pile of coal?
有一堆煤，第一天运走全部的(2/5)，第二天运走的比第一天多运2吨，这时还剩下12吨．这堆煤原有多少吨？
<gadget id="calculator">12 + 2</gadget>
<output>14</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">14 / (1/5)</gadget>
<output>70</output>

<result>70</result>