A fruit store shipped 1,440 kilograms of oranges in boxes of the same quality, sold 80 boxes, and left 240 kilograms. How many kilograms per box of oranges?
一个水果商店，运来1440千克箱装桔子，每箱质量相同，卖出80箱，还剩240千克，每箱桔子多少千克？
<gadget id="calculator">1_440 - 240</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 80</gadget>
<output>15</output>

<result>15</result>