A bag of 50 kilograms of rice, eat 20% of it, and put in the remaining 20%, what is the weight of the rice now?
一袋大米50千克，吃掉20%，再装进余下数量的20%，现在大米重多少千克．
<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">50 * (4/5)</gadget>
<output>40</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">40 * (6/5)</gadget>
<output>48</output>

<result>48</result>