帮帮我解一道狗狗数学题。

charlesyang · 发表于 2010-1-24 21:22:16

An instructor scored a student's test of 50 questions by subtracting 2 times the number of incorrect answers from the number of correct answers.If the student answered all of the questions and received a score of 38,how many questions did that student answer correctly?
(A)19 (B)38 (C)41 (D)44 (E)46

阿奔 · 发表于 2010-1-24 21:36:44

是否选E？对的数是x 不对的就是（50-x)
有 38=x-2(50-x)
x=46

bernadotte · 发表于 2010-1-24 21:36:53

扣分50-38=12 错了6个題对的是44道答案是D
对不对?

阿奔 · 发表于 2010-1-24 21:39:56

ls同学那个50是题数 38是分数没说一题一分吧就不能这样减吧

charlesyang · 发表于 2010-1-24 21:45:46

答案是E。谢谢！

阿奔 · 发表于 2010-1-24 21:47:14

好的~不客气

帮帮我解一道狗狗数学题。

所属分类: GMAT考试

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