The fruit shop brings in 50 kilograms of fruit, sells it on the first day (2/5), and sells it on the second day (4/5). How many kilograms of fruit were sold the next day?
水果店运进50千克水果，第一天卖出(2/5)，是第二天的(4/5)．第二天卖出多少千克水果？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/5) / (4/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * (1/2)</gadget>
<output>25</output>

<result>25</result>