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

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Director
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How many of the 42 people in a group are employed students? [#permalink] New post 23 Sep 2007, 10:33
00:00
A
B
C
D
E

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(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
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 to follow.
Manager
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 [#permalink] New post 23 Sep 2007, 13:23
well, i would pick C if i were to assume that there are only two groups that consist of 42 people. But, however, this is not explicitly stated. So E?
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 [#permalink] New post 23 Sep 2007, 16:01
It is E, so I'm guessing that is the reason. Seems like a screwy question if you ask me.[/quote]
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 [#permalink] New post 23 Sep 2007, 19:22
St1:
Only tells us 29 are employed. How many of the employed are students, we have no clue. Insufficient.

St2:
Only tells us 24 of the group are students. How many of these 24 are employed, we have no idea. Insufficient.

Using st1 and st2 doesn't provide further clues. Insufficient.

Ans E

(Note: If you tried to solve this using a table, you would find that there isn't sufficient information)
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Re: DS: Venn Diagram? [#permalink] New post 07 Jan 2008, 11:23
draw out a double set matrix. u have all the "total" info on the sides but nothing on the inside of the table. u need at least one element on the inside, along with the totals, to solve the question.
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Re: DS: Venn Diagram? [#permalink] New post 07 Jan 2008, 13:41
11..

Let X be the employed students..

n( E only ) + n( S only ) + X = 42
[ 29 – X ] + [ 24 – X ] + X = 42

X = 11
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Re: DS: Venn Diagram? [#permalink] New post 07 Jan 2008, 14:34
dvdv wrote:
11..

Let X be the employed students..

n( E only ) + n( S only ) + X = 42
[ 29 – X ] + [ 24 – X ] + X = 42

X = 11


OA has already been posted as E, but just out of curiosity how do you get 11 just with the formulae. i tried the diagram but could not come to any clue?
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Re: DS: Venn Diagram? [#permalink] New post 07 Jan 2008, 18:50
dvdv wrote:
11..

Let X be the employed students..

n( E only ) + n( S only ) + X = 42
[ 29 – X ] + [ 24 – X ] + X = 42

X = 11


I find some gaps in your fomula
first: I think the correct is "-" not "+", if "+" X can not be 11
second: from the information of the problems, you can not assume that the group of none-student and none-employed is zero.

That is why answer should be E
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Re: DS: Venn Diagram? [#permalink] New post 08 Jan 2008, 20:18
what is this option E ?? I am new to this group and just wondering.. I cant see options mentioned in the problem. And what is OA ??
Re: DS: Venn Diagram?   [#permalink] 08 Jan 2008, 20:18
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