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DS Problem of employed students.

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sanjeethbm
 Post subject: DS Problem of employed students.
 Post Posted: Tue Jun 14, 2011 12:00 am 
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Students


Posts: 12
How many of the 42 people in the group are employed students?
1. 29 of the 42 people are employed.
2. 24 of the 42 people are students.

My Approach
Since we need to find employed students I consider this number to be as 'n'.
29 of 42 are employed = 29 - n
24 of 42 are students = 24 - n

Adding it up
29 - n + 24 - n + n = 42
=> n = 13
My answer is C, however the correct ans is E.
Please let me know if my approach is right.

- Sanjeeth
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RonPurewal
 Post subject: Re: DS Problem of employed students.
 Post Posted: Tue Jun 14, 2011 7:27 am 
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ManhattanGMAT Staff


Posts: 7146
sanjeethbm wrote:
My answer is C, however the correct ans is E.
Please let me know if my approach is right.


hmm?
you got the wrong answer, so you know that the answer to “is my approach right?” is no.

what you're missing is the possibility that the group contains people who are neither students nor employed. (in general, you must consider “neither a nor b” a possibility in any overlapping-set problem, unless the problem statement specifically excludes such a possibility.)
if you had used the overlapping-set grid described in our word translations strategy guide, it would have been easier for you to realize that this is a possibility.
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sanjeethbm
 Post subject: Re: DS Problem of employed students.
 Post Posted: Wed Jun 15, 2011 2:06 am 
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Students


Posts: 12
Now I know which is the missing link!

Thank you Ron!
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jnelson0612
 Post subject: Re: DS Problem of employed students.
 Post Posted: Sun Jun 19, 2011 11:34 pm 
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ManhattanGMAT Staff


Posts: 1857
:-)

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Jamie Nelson
ManhattanGMAT Instructor
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