合唱团成员排练时站在一个五级的台阶上,最上面一级站N个人,若上面一级比下面一级多站一个人,则多了7个人;若上面一级比下面一级少站一个人,则少多少人?A...

作者: rantiku 人气: - 评论: 0
问题 合唱团成员排练时站在一个五级的台阶上,最上面一级站N个人,若上面一级比下面一级多站一个人,则多了7个人;若上面一级比下面一级少站一个人,则少多少人? A.4个 B.7个 C.10个 D.13个
选项
答案 D
解析 根据第一种情况,可知总人数为5(N-2)+7=5N-3;第二种情况,所需人数为5(N+2)=5N+10,则所求为5N+10-(5N-3)=13人。

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