The price of a chair is 55 yuan, the price of a table is 85 yuan more expensive than the chair, the price of a sofa is twice the sum of a chair and a table, how much is the price of a sofa?
一把椅子售价55元，一张桌子的售价比椅子贵85元，一张沙发的售价相当于一把椅子与一张桌子之和的2倍，一张沙发售价多少元？
<gadget id="calculator">55 + 85 + 55</gadget>
<output>195</output>

<gadget id="calculator">195 * 2</gadget>
<output>390</output>

<result>390</result>