Zhang Qiang bought a pair of trousers and a top. The top was 185 yuan, which was 15 yuan cheaper than twice the price of the trousers. How much are these pants?
张强买了一条裤子和一件上衣，上衣185元，比裤子的2倍便宜15元．这件裤子多少钱？
<gadget id="calculator">15 + 185</gadget>
<output>200</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>