A grain store sells 20% of the flour, and there are 5 tons left. How many tons of flour does the grain store have? What is the correct column.
某粮店卖出面粉20%，还剩5吨，粮店原有面粉多少吨？正确列式是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / (4/5)</gadget>
<output>25/4 = around 6.25</output>

<result>25/4 = around 6.25</result>