The fruit shop has a total of 900 kilograms of oranges and apples, of which oranges account for 30%. After selling some oranges, oranges account for 20% of these two kinds of fruits. How many kilos of oranges were sold?
水果店有橘子和苹果共900千克，其中橘子占30%，卖出一些橘子后，橘子就占这两种水果的20%．卖出了多少千克橘子？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">900 * (7/10)</gadget>
<output>630</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">630 / (4/5)</gadget>
<output>1_575/2 = around 787.5</output>

<gadget id="calculator">900 - (1_575/2)</gadget>
<output>225/2 = around 112.5</output>

<result>225/2 = around 112.5</result>