[計量] The scores reported for a certain multiple-choice ...
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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?
(A) 5
(B) 10
(C) 15
(D) 25
(E) 30
Ans: C
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