A bag of flour, ate 20 kilograms, exactly (4/5) of this bag of flour, how much does this bag of flour weigh?
一袋面粉，吃了20千克，正好是这袋面粉的(4/5)，这袋面粉有多重？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>