children's top is 180 yuan, a pair of trousers is 33 yuan cheaper than the top, and a skirt is 21 yuan more expensive than a pair of trousers. How much is this dress?
一件儿童上衣180元，一条裤子比上衣便宜33元，一条裙子又比一条裤子贵21元．这条裙子多少钱？
<gadget id="calculator">180 - 33</gadget>
<output>147</output>

<gadget id="calculator">147 + 21</gadget>
<output>168</output>

<result>168</result>