For a pile of coal, the ratio of the number of tons removed on the first day to the remaining amount is 1:5. After 4.5 tons were removed on the second day, 1/3 of the total amount was removed in two days. How much is this pile of coal? Ton?
一堆煤，第一天运走的吨数与剩下的比是1：5，第二天运走4.5吨后，两天正好运走了总数的(1/3)，这堆煤有多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/3) - (1/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">4.5 / (1/6)</gadget>
<output>27</output>

<result>27</result>