There is a batch of fruit, after the original (2/5) is sold, another 1200 kg is shipped in, and the fruit at this time is exactly the original (2/3). Do you know how much fruit was sold?
有一批水果，卖出原来的(2/5)以后，又运来1200千克，这时的水果恰好是原来的(2/3)．你知道卖出了多少水果？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/3) - (3/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1_200 / (1/15)</gadget>
<output>18_000</output>

<gadget id="calculator">18_000 * (2/5)</gadget>
<output>7_200</output>

<result>7_200</result>