The skirt is 13.5 yuan more expensive than the jacket, and the trousers are 8.7 yuan cheaper than the jacket. How much is the skirt more expensive than the trousers?
裙子比上衣贵13.5元，裤子比上衣便宜8.7元，裙子比裤子贵多少元？
<gadget id="calculator">13.5 + 8.7</gadget>
<output>22.2</output>

<result>22.2</result>