The fruit shop has 3 boxes of oranges weighing 49.5 kg in total, and 3 boxes of apples weighing 73.5 kg in total. On average, how much does a box of apples weigh more than a box of oranges?
水果店有3箱桔子共重49.5千克，还有3箱苹果共重73.5千克，平均一箱苹果比一箱桔子重多少千克？
<gadget id="calculator">73.5 / 3</gadget>
<output>24.5</output>

<gadget id="calculator">49.5 / 3</gadget>
<output>16.5</output>

<gadget id="calculator">24.5 - 16.5</gadget>
<output>8</output>

<result>8</result>