Dad didn't come home for 7 days on a business trip. After she got home, she tore off the 7-day calendar at one time, and the sum of the dates in the 7 days was 49. What day is it when mom comes home?
爸爸出差7天没有回家．她到家后，一次撕下这7天的日历，这7天日期数的和是49．妈妈回家这天是几号？
<result>10</result>