After eating 40% of a bag of rice, there are 12 kilograms left. How many kilograms of rice are there in this bag?
一袋大米吃掉40%后，还剩12千克，这袋大米共有多少千克．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">12 / (3/5)</gadget>
<output>20</output>

<result>20</result>