The price of a pair of trousers is 18 yuan, and the price of a jacket is twice that of a pair of trousers. How much does it cost to buy a set of such clothes?
一条裤子的价格是18元，一件上衣的价格是一条裤子的2倍，买一套这样的衣服共用多少元钱？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 + 18</gadget>
<output>54</output>

<result>54</result>