pile of coal, (1/4) of the pile of coal was removed on the first day, and (1/2) of the first day was removed on the second day, leaving 120 tons. How many tons of this pile of coal are there?
一堆煤，第一天运走了这堆煤的(1/4)，第二天运走了第一天的(1/2)，还剩下120吨，这堆煤有多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) * (1/2)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/4) - (1/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">120 / (5/8)</gadget>
<output>192</output>

<result>192</result>