A jacket is 78 yuan, a pair of trousers is 15 yuan cheaper than the jacket, and the price of a pair of leather shoes is twice the price of a pair of trousers. How much is a pair of leather shoes?
一件上衣78元，一条裤子比上衣便宜15元，一双皮鞋的价格正是一条裤子价格的2倍，一双皮鞋多少元？
<gadget id="calculator">78 - 15</gadget>
<output>63</output>

<gadget id="calculator">63 * 2</gadget>
<output>126</output>

<result>126</result>