The fruit shop shipped 300 kilograms of oranges, 50 kilograms more grapes than oranges, and twice the weight of grapes in apples, how many kilograms more apples than oranges?
水果店运来橘子300千克，运来的葡萄比橘子多50千克，运来苹果的重量是葡萄的2倍，苹果比橘子多运来多少千克？
<gadget id="calculator">300 + 50</gadget>
<output>350</output>

<gadget id="calculator">350 * 2</gadget>
<output>700</output>

<gadget id="calculator">700 - 300</gadget>
<output>400</output>

<result>400</result>