There are 55 handshakes at the end of a certain banquet. If everyone at the banquet and everyone else at the banquet shakes hands only once, what is the total number of people at the banquet?
某次宴会结束时总共握手55次，如果参加宴会的每一个人，和其他人参加宴会的每一个人都只握一次手，参加宴会的一共有多少人．
<result>11</result>