The number of kilograms of oranges shipped by the fruit shop is equal to that of apples (5/7). When 20% of the oranges are sold, the remaining kilograms are 300 kilograms less than that of apples. How many kilograms of oranges are shipped?
水果店运来桔子的千克数是苹果的(5/7)，当桔子卖出20%后，剩下的千克数比苹果少300千克，运来桔子多少千克？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">(5/7) * (1/5)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) - (5/7)</gadget>
<output>-4/7 = around -0.571429</output>

<gadget id="calculator">1 + (-4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">300 / (3/7)</gadget>
<output>700</output>

<gadget id="calculator">700 * (5/7)</gadget>
<output>500</output>

<result>500</result>