Xiaoxiao’s weight is 38 kg, Naughty is 7.2 kg heavier than Xiaoxiao, Ding Ding weighs 33.4 kg, how much lighter is Ding Ding than Naughty?
笑笑的体重是38千克，淘气比笑笑重7.2千克，丁丁重33.4千克，丁丁比淘气轻多少千克？
<gadget id="calculator">7.2 - 33.4</gadget>
<output>-26.2</output>

<gadget id="calculator">38 + (-26.2)</gadget>
<output>11.8</output>

<result>11.8</result>