A children's top is 50 yuan, a pair of trousers is 13 yuan cheaper than the top, and a skirt is 8 yuan more expensive than the trousers. How much is this dress?
一件儿童上衣50元，一条长裤比上衣便宜13元，一条裙子又比长裤贵8元．这条裙子多少钱？
<gadget id="calculator">50 - 13</gadget>
<output>37</output>

<gadget id="calculator">37 + 8</gadget>
<output>45</output>

<result>45</result>