Uncle Wang's orchard harvested 358 kilograms of apples. A total of 26 boxes have been installed, and there are 20 kg left. How many kilograms of apples are packed in an average box?
王大爷的果园收获苹果358千克．共装了26箱，还剩20千克．平均每箱装多少千克苹果？
<gadget id="calculator">358 - 20</gadget>
<output>338</output>

<gadget id="calculator">338 / 26</gadget>
<output>13</output>

<result>13</result>