To transport a pile of sand, (2/3) of the total amount was transported for the first time, and (1/4) of the total amount was transported for the second time. The first time transported 20 tons more than the second time. How many tons is this pile of sand ?
要运一堆沙，第一次运了总数的(2/3)，第二次运了总数的(1/4)，第一次比第二次多运20吨，这堆沙有多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">20 / (5/12)</gadget>
<output>48</output>

<result>48</result>