GMATPrep Employed Students

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mdavis: Senior | Next Rank: 100 Posts; Posts: 44; Joined: Thu Nov 20, 2008 2:18 pm; Thanked: 1 times

by mdavis » Mon Feb 16, 2009 2:00 pm

How many of the 42 people in a group are employed students?

(1) 29 of the 42 people are employed

(2) 24 of the 42 people are students

OA E

Could someone tell me why?

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Source: Beat The GMAT — Data Sufficiency | Mon Feb 16, 2009 2:00 pm

AJ2009: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Sat Feb 07, 2009 9:00 am; Thanked: 1 times

by AJ2009 » Mon Feb 16, 2009 3:17 pm

the best way to see the answer is to draw a grid

employed unemployed total
student 24

non-student 18

total 29 13 42

I have filled in the information from both statements and as you can see it is not possible to work out any cross section information. If we had one value like the number of unemployed/non-student the rest can be worked out. So for example is that figure was 5 the the table would be

employed unemployed total
student 16 8 24

non-student 13 5 18

total 29 13 42

hope this is clear!

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AJ2009: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Sat Feb 07, 2009 9:00 am; Thanked: 1 times

by AJ2009 » Mon Feb 16, 2009 3:18 pm

oops, the spacing got all messed up, sorry. it is impossible to use this

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mdavis: Senior | Next Rank: 100 Posts; Posts: 44; Joined: Thu Nov 20, 2008 2:18 pm; Thanked: 1 times

by mdavis » Mon Feb 16, 2009 6:00 pm

No problem, I see exactly what you did. Thanks!

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