A bag of rice, eat (2/5), just eat 20 kg, how much does this bag of rice weigh?
一袋大米，吃了(2/5)，刚好吃了20千克，这袋大米重多少千克．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<result>50</result>