During the Spring Festival, Xiao Ming spent 5 days before and after traveling to Beijing. The sum of the 5 numbers represented by the date of these 5 days is exactly 55. How many days does it take for Xiao Ming to come home?
春节期间小明到北京旅游前后用了5天，这5天日期表示的5个数之和正好是55．小明到家的这天是几日？
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