A pile of yellow sand, transported away 25% on the first day, 4 tons less than the second day. At this time, there were 56 tons left. How many tons is this pile of yellow sand?
一堆黄沙，第一天运走25%，比第二天少运4吨．这时还剩下56吨．这堆黄沙共多少吨？
<gadget id="calculator">56 + 4</gadget>
<output>60</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) + (1/4)</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">60 / (1/2)</gadget>
<output>120</output>

<result>120</result>