The store shipped 11 boxes of apples and 11 boxes of oranges. Each box of apples weighed 28 kilograms, and each box of oranges weighed 21 kilograms. How many kilograms more apples were shipped than oranges?
商店运来苹果和桔子各11箱，每箱苹果重28千克，每箱桔子重21千克，运进苹果比桔子多多少千克？
<gadget id="calculator">11 * 28</gadget>
<output>308</output>

<gadget id="calculator">11 * 21</gadget>
<output>231</output>

<gadget id="calculator">308 - 231</gadget>
<output>77</output>

<result>77</result>