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DS : Averages

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Senior Manager
Senior Manager
User avatar
Joined: 16 Jan 2009
Posts: 362
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 2

Kudos [?]: 67 [0], given: 16

GMAT Tests User
DS : Averages [#permalink] New post 07 Jun 2009, 10:08
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
DS : Averages
explanations please.
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Lahoosaher

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Joined: 03 Jun 2009
Posts: 805
Location: New Delhi
WE 1: 5.5 yrs in IT
Followers: 62

Kudos [?]: 391 [0], given: 56

GMAT Tests User
Re: DS : Averages [#permalink] New post 07 Jun 2009, 10:15
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.
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Senior Manager
Senior Manager
User avatar
Joined: 16 Jan 2009
Posts: 362
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 2

Kudos [?]: 67 [0], given: 16

GMAT Tests User
Re: DS : Averages [#permalink] New post 07 Jun 2009, 10:35
Thanks for the answer and suggestion bigoyal.
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Lahoosaher

Manager
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avatar
Joined: 11 Aug 2008
Posts: 162
Followers: 1

Kudos [?]: 36 [0], given: 8

GMAT Tests User
Re: DS : Averages [#permalink] New post 08 Jun 2009, 08:49
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, 08:49
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