For a pile of coal, 1/3 of it was removed on the first day, and 40 tons were removed on the second day. A total of 60% of this pile of coal was removed in two days. How many tons was this pile of coal originally?
一堆煤，第一天运走它的(1/3)，第二天运走40吨，两天共运走这堆煤的60%，这堆煤原来有多少吨？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">40 / (4/15)</gadget>
<output>150</output>

<result>150</result>