Naughty's weight is 41.3 kg, and Ding Ding's weight is 39.8 kg. How many kilograms is Ding Ding lighter than Naughty?
淘气的体重是41.3千克，丁丁的体重是39.8千克．丁丁比淘气轻多少千克？
<gadget id="calculator">41.3 - 39.8</gadget>
<output>1.5</output>

<result>1.5</result>