A top is 78 yuan, a pair of trousers is 19 yuan cheaper than a top, and a skirt is 15 yuan more expensive than a pair of trousers. How much is a skirt?
一件上衣78元，一条裤子比一件上衣便宜19元，一条裙子又比一条裤子贵15元，一条裙子多少元？
<gadget id="calculator">78 - 19</gadget>
<output>59</output>

<gadget id="calculator">59 + 15</gadget>
<output>74</output>

<result>74</result>