A pair of sneakers is 68.5 yuan more expensive than a pair of overshoes, a pair of leather shoes is 46.5 yuan more expensive than a pair of sneakers, how much is a pair of leather shoes more expensive than a pair of overshoes?
一双球鞋比一双套鞋贵68.5元，一双皮鞋比一双球鞋贵46.5元，一双皮鞋比一双套鞋贵多少元？
<gadget id="calculator">68.5 + 46.5</gadget>
<output>115</output>

<result>115</result>