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Students took a test and received either A’s, B’s, C’s, D’s, or F’s. I

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Students took a test and received either A’s, B’s, C’s, D’s, or F’s. I [#permalink]

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New post 22 Jan 2016, 10:33
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A
B
C
D
E

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71% (01:16) correct 29% (00:00) wrong based on 10 sessions

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Re: Students took a test and received either A’s, B’s, C’s, D’s, or F’s. I [#permalink]

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New post 24 Jan 2016, 07:20
30+50=80% of the students got A, B, C or D.
Therefore 100-80=20% of the students got an F.

Question: What is the number of students who got F? OR What is the total number of students?

1. Not Sufficient
30% of the students for a A or a B. But we do not know exactly how many got only B.
If 10 got only B, we cant say that these 10 were the 30% of the class because that 30% included the ones who had an A.

2. Sufficient
20% of the population of students (=40) gives us the answer.

Answer: B
Re: Students took a test and received either A’s, B’s, C’s, D’s, or F’s. I   [#permalink] 24 Jan 2016, 07:20
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Students took a test and received either A’s, B’s, C’s, D’s, or F’s. I

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