Fudong Fruit Shop sold a batch of fruits in 3 days. On the first day, 100 kilograms were sold, accounting for (1/5) of this batch of fruits. The ratio of the fruits sold on the second day to the fruits sold on the third day was 3:5. How many kilograms of fruit did you buy on the third day?
富东水果店用3天卖出了一批水果．第一天卖了100千克，占这批水果的(1/5)，第二天卖出的水果与第三天卖出的水果的比是3：5．第三天买了多少千克水果？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / (1/5)</gadget>
<output>500</output>

<gadget id="calculator">500 - 100</gadget>
<output>400</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">400 * (5/8)</gadget>
<output>250</output>

<result>250</result>