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Of the students in a class, 90% had taken a course in writing, or math

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Of the students in a class, 90% had taken a course in writing, or math  [#permalink]

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New post 11 Feb 2019, 06:26
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A
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E

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  45% (medium)

Question Stats:

44% (01:02) correct 56% (01:36) wrong based on 9 sessions

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Of the students in a class, 90% had taken a course in writing, or math, or both. What percent of the students had taken both a course in writing and a course in math?

(1) 55% of the students had taken a course in writing.

(2) 35% of the students had taken a course in only math.

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Re: Of the students in a class, 90% had taken a course in writing, or math  [#permalink]

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New post 11 Feb 2019, 07:14
Consider 100 students in the class.

From S1:

55 had taken Writing. No info about maths or both.
Hence S1 is insufficient.

From S2:

35 had only taken maths. Again, No info about writing or both.
Hence S2 is insufficient.

Combining both also don't give info about those who had taken both.
Hence E is the answer.
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Re: Of the students in a class, 90% had taken a course in writing, or math  [#permalink]

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New post 17 Feb 2019, 04:04
rohan2345 wrote:
Of the students in a class, 90% had taken a course in writing, or math, or both. What percent of the students had taken both a course in writing and a course in math?

(1) 55% of the students had taken a course in writing.

(2) 35% of the students had taken a course in only math.



Dear Moderator,
Found this DS question in the PS section of overlapping sets , hope you will do the needful. Thank you.
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Re: Of the students in a class, 90% had taken a course in writing, or math   [#permalink] 17 Feb 2019, 04:04
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Of the students in a class, 90% had taken a course in writing, or math

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