A pile of sand was transported away (3/8), exactly 21 tons, how many tons is this pile of sand? What is the column
一堆沙，运走了(3/8)，正好运走了21吨，这堆沙有多少吨？列式是多少
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">21 / (3/8)</gadget>
<output>56</output>

<result>56</result>