120 Primary 6 students elect student representatives, each can cast one vote, and there are only two candidates, A and B. Among the 100 votes that have been counted, A gets 45 votes, B gets 35 votes, and the rest abstain. How many votes does A need at least to ensure that he will be elected?
120名小六学生选举学生代表，每人可投一票，候选人只有甲、乙两人．在已点选的100票中，甲得45票，乙得35票，其余弃权．甲最少还需要多少张选票才确保他一定当选﹖
<result>6</result>