After a batch of fruit sold 40% of the original quantity, another 1200 kilograms was shipped in. At this time, the fruit was just 2/3 of the original quantity. How many kilograms of fruit were sold?
一批水果卖出原有的40%以后，又运来1200千克，这时的水果恰好是原来的(2/3)，卖出了水果多少千克？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">40 / 100</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>