The total weight of a basket of fruit is 480 kg. After selling 20% of the fruit, the total weight of the basket is 390 kg. How many kg of fruit are there?
一筐水果连筐共重480千克，卖出水果的20%后，连筐共重390千克，水果有多少千克？
<gadget id="calculator">480 - 390</gadget>
<output>90</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">90 / (1/5)</gadget>
<output>450</output>

<result>450</result>