A certain brand of milk in RT-Mart Supermarket held a promotional activity: "The first bottle is at the original price, and the second bottle is half price." Aunt Wang bought such two bottles of milk and spent a total of 22.5 yuan. So what is the original price per bottle of this milk?
大润发超市某品牌牛奶搞促销活动："第一瓶原价，第二瓶半价"，王阿姨买了这样的两瓶牛奶共花了22.5元．那么这种牛奶每瓶的原价是多少？
<gadget id="calculator">1 + 0.5</gadget>
<output>1.5</output>

<gadget id="calculator">22.5 / 1.5</gadget>
<output>15</output>

<result>15</result>