Aunt Li bought 12 boxes of apples and 9 boxes of pears, and paid a total of 648 yuan. It is known that the total price of the purchased apples and pears is exactly the same. How much is each box of apples?
李阿姨购买了12箱苹果和9箱梨，一共付了648元钱，已知购买的苹果和梨的总价正好相等，每箱苹果多少元？
<gadget id="calculator">648 / 2 / 12</gadget>
<output>27</output>

<result>27</result>