For a pile of coal, the ratio of the tonnage to the total tonnage on the first day is 1:4. After 4.5 tons were removed on the second day, 1/3 of the total amount was removed in two days. This pile of coal has How many tons?
一堆煤，第一天运走的吨数与总吨数的比是1：4，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 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">4.5 / (1/12)</gadget>
<output>54</output>

<result>54</result>