37.5% of a pile of sand is used up during the day, and 21.6 tons are transported in at night. At this time, the sand is only 7/8 of the original amount. How many tons is this pile of sand originally?
一堆沙白天用去37.5%，晚上又运来21.6吨，这时的沙只有原来的(7/8)，原来这堆沙有多少吨？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">37.5 / 100</gadget>
<output>0.375</output>

<gadget id="calculator">1 - 0.375</gadget>
<output>0.625</output>

<gadget id="calculator">(7/8) - 0.625</gadget>
<output>0.25</output>

<gadget id="calculator">21.6 / 0.25</gadget>
<output>86.4</output>

<result>86.4</result>