A pile of coal has been transported away (2/15), and the remaining coal is 220 tons more than the one removed. How many tons is this pile of coal?
一堆煤已运走(2/15)，剩下的比运走的多220吨，这堆煤多少吨？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 - (2/15) - (2/15)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">220 / (11/15)</gadget>
<output>300</output>

<result>300</result>