2. 外语
  3. The scores reported for a certain multiple-choice test were derived by subtracting 1/3 of the number of wrong answers from the n

The scores reported for a certain multiple-choice test were derived by subtracting 1/3 of the number of wrong answers from the n

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问题 The scores reported for a certain multiple-choice test were derived by subtracting 1/3 of the number of wrong answers from the number of right answers. On a 40-question test, if none of the questions was omitted and the score reported was 20, how many wrong answers were there?
选项 A、5
B、10
C、15
D、25
E、30
答案C
解析 某一多项选择考试的分数的计算是用答对的题数减去答错题数的1/3。在一个由40道题组成的测验中，若无题遗漏，且考试分数为20，问答错的题数有多少个?
解：本题的正确答案为(C)。设答错题数为x个，则由题意可得：(40-x)-1/3 x =20 → x=15
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