A children's top is 98 yuan, a pair of trousers is 12 yuan cheaper than the top, and the price of a skirt is twice that of trousers. How much is this dress?
一件儿童上衣98元，一条长裤比上衣便宜12元，一条裙子的价格是长裤的2倍．这条裙子多少钱？
<gadget id="calculator">98 - 12</gadget>
<output>86</output>

<gadget id="calculator">86 * 2</gadget>
<output>172</output>

<result>172</result>