There is a pile of coal, (7/20) of the total amount is removed in the first time, and (1/4) of the total amount is removed in the second time, a total of 1,500 tons are removed in the two times, how many tons is there in this pile of coal?
有一堆煤，第一次运走总数的(7/20)，第二次运走总数的(1/4)，两次共运走1500吨，这堆煤有多少吨？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(7/20) + (1/4)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_500 / (3/5)</gadget>
<output>2_500</output>

<result>2_500</result>