A bag of rice has eaten 20 kilograms, and there is still (1/5) left uneaten. How much does this bag of rice weigh?
一袋大米，已经吃了20千克，还剩下(1/5)没有吃，这袋大米重多少千克？
<gadget id="calculator">1 / 5</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">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>