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# GMAT Prep Avg.

Author Message
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Manager
Joined: 21 Jul 2006
Posts: 83
Followers: 1

Kudos [?]: 7 [0], given: 0

GMAT Prep Avg. [#permalink]  27 Aug 2006, 21:23
GMAT Prep Q.
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CEO
Joined: 20 Nov 2005
Posts: 2913
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 18

Kudos [?]: 123 [0], given: 0

C

Let m - managers, d - Directors
A - Av salary of managers, B - Av salary of directors

We have to find d/(m+d)

St1: A = (mA+dB)/(m+d) - 5000
mA+dA = mA +dB - 5000(m+d)
d(B-A) = 5000(m+d)
We don't know A and B: INSUFF

St2: B = (mA+dB)/(m+d) + 15000
mB+dB = mA+dB + 15000(m+d)
m(B-A) = 15000(m+d)
We don't know A and B: INSUFF

Together:
Divide two equations we get d/m = 1/3
So 25% are managers.: SUFF
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Director
Joined: 17 Jul 2006
Posts: 716
Followers: 1

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

Dahiya thanks a ton for the explanation. [#permalink]  28 Aug 2006, 12:55
In my practice test , I answered E and couldn't able to solve.
Dahiya thanks a ton for the explanation.   [#permalink] 28 Aug 2006, 12:55
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