The weight of a box of pears is 12 kg, and the weight of a box of apples is 15 kg and 500 grams. How many grams are apples heavier than pears?
一箱梨的重量是12千克，一箱苹果的重量是15千克500克，苹果比梨重多少克？
<gadget id="calculator">15.5 - 12</gadget>
<output>3.5</output>

<result>3.5</result>