A bag of candies weighs 500 grams. After increasing (1/5), eat (1/5), how many grams of candies are there now?
一袋糖果重500克，增加(1/5)后，再吃掉(1/5)，现在还有糖果多少克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">500 * (6/5) * (4/5)</gadget>
<output>480</output>

<result>480</result>