The fruit shop brings a cart of fruit, sells (1/5) of it on the first day, and sells the rest (1/5) on the second day, leaving 320 kilograms. How many kilograms of this cart of fruit are there?
水果店运来一车水果，第一天卖出它的(1/5)，第二天卖出余下的(1/5)，还剩320千克，这车水果原有多少千克？
<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">(4/5) * (4/5)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">320 / (16/25)</gadget>
<output>500</output>

<result>500</result>