A pile of sand is transported away (2/7), exactly 16 tons are transported away, how many tons is this pile of sand? What is the correct column
一堆沙运走了(2/7)，恰好运走16吨，这堆沙有多少吨？列式正确的是多少
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">16 / (2/7)</gadget>
<output>56</output>

<result>56</result>