A pile of sand was transported 40% for the first time, and 112 tons for the second time, accounting for (3/4) of the total. How many tons is this pile of yellow sand?
一堆沙子第一次运走了40%，第二次运走112吨，两次一共占总数的(3/4)．这堆黄沙共有多少吨？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">112 / (7/20)</gadget>
<output>320</output>

<result>320</result>