某次考试100道选择题,每做对一题得1.5分,不做或做错一题扣1分,小李共得100分,那么他答错(包括不做)多少题?A.20 B.25 C.30 D.80

作者: rantiku 人气: - 评论: 0
问题 某次考试100道选择题,每做对一题得1.5分,不做或做错一题扣1分,小李共得100分,那么他答错(包括不做)多少题? A.20 B.25 C.30 D.80
选项
答案 A
解析 如果全做对,可以得到150分,然而每做错(包括不做)一道题损失1+1.5=2.5分,则做错 (包括不做)(150-100)÷2.5=20 题。

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