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# DS : Averages

Author Message
Senior Manager
Joined: 16 Jan 2009
Posts: 350
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)

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07 Jun 2009, 11:08
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DS : Averages
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_________________

Lahoosaher

Director
Joined: 03 Jun 2009
Posts: 774
Location: New Delhi
WE 1: 5.5 yrs in IT

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07 Jun 2009, 11:15
Let Mary's salary = M,
Jim's J
and Kate's K

Also, given (M-J) = 2(M-K)
or, M-J = 2M-2K
or, -M -J -K = -3K
or M+J+K = 3K
or, (M+J+K)/3 = K

means the avg salary is equal to Kate's salary, and that is what given in 2nd option. Hence B.

Just a suggestion from my side, for DS, try to simplify the question stem as much as you can. Then start evaluating the two options.
_________________
Senior Manager
Joined: 16 Jan 2009
Posts: 350
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)

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07 Jun 2009, 11:35
Thanks for the answer and suggestion bigoyal.
_________________

Lahoosaher

Manager
Joined: 11 Aug 2008
Posts: 137

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08 Jun 2009, 09:49
Qs => M-J=2(M-K) => M=2K-J
Avg (M,K,F)= (M+K+J)/3= (2K-J+K+J)/3=K
Hence B
Re: DS : Averages   [#permalink] 08 Jun 2009, 09:49
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