Wangwang Fruit Shop brings in 225 kg of apples and 180 kg of pears. If each 15 kg is packed in a box, how many more boxes are packed in apples than in pears?
旺旺水果店运进苹果225千克，鸭梨180千克，如果每15千克装一箱，苹果比鸭梨多装多少箱？
<gadget id="calculator">225 / 15</gadget>
<output>15</output>

<gadget id="calculator">180 / 15</gadget>
<output>12</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<result>3</result>