There is a pile of sand on the construction site, 40% of it was used on the first day, 10.8 tons on the second day, and 62.5% of the sand was used up in the two times. How many tons of this pile of sand are there?
工地有一堆沙，第一天用去40%，第二天用去10.8吨，两次共用去这堆沙的62.5%，这堆沙原有多少吨？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.625 - (2/5)</gadget>
<output>0.225</output>

<gadget id="calculator">10.8 / 0.225</gadget>
<output>48</output>

<result>48</result>