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# %age=(Income 80 – Income70)/Income70

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Senior Manager
Joined: 21 Apr 2008
Posts: 497
Schools: Kellogg, MIT, Michigan, Berkeley, Marshall, Mellon
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%age=(Income 80 – Income70)/Income70 [#permalink]  18 May 2008, 12:12
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Hello all,

Can someone help me with the Data Sufficiency problem 91 from OG11?

OG11 says the solution is E. However, I think it should be C.

My explanation:

%age=(Income 80 – Income70)/Income70

1 – Income70=(2/3)*IncomeCountryX (Not sufficient)
2 – Income80=(1/2)*IncomeCountryX (Not sufficient)

But together:

%age=[(1/2)*IncomeCountryX - (2/3)*IncomeCountryX]/ (2/3)*IncomeCountryX = [(1/2)-(2/3)]/(2/3)

Therefore, 1+2 are sufficient. Answer C

Where is my error?

Thanks a lot
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johnlewis1980-s-profile-feedback-is-more-than-welcome-80538.html

I'm not linked to GMAT questions anymore, so, if you need something, please PM me

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Director
Joined: 23 Sep 2007
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Re: DS – Problem 91 from OG11 [#permalink]  18 May 2008, 13:21
The median income for country Y could stay the same, but the median income for country X can fluctuate.

If you post the complete question, you might get more help from other people. Not everybody on this forum has a OG11 book in front of them.
Senior Manager
Joined: 21 Apr 2008
Posts: 497
Schools: Kellogg, MIT, Michigan, Berkeley, Marshall, Mellon
Followers: 8

Kudos [?]: 29 [0], given: 13

Re: DS – Problem 91 from OG11 [#permalink]  18 May 2008, 23:02
gmatnub wrote:
The median income for country Y could stay the same, but the median income for country X can fluctuate.

If you post the complete question, you might get more help from other people. Not everybody on this forum has a OG11 book in front of them.

I'm afraid It's not allowed to post questions from that book (at least, that's what I understood from one of gmatclub rules)
_________________

johnlewis1980-s-profile-feedback-is-more-than-welcome-80538.html

I'm not linked to GMAT questions anymore, so, if you need something, please PM me

I'm already focused on my application package

My experience in my second attempt
http://gmatclub.com/forum/p544312#p544312
My experience in my third attempt
630-q-47-v-28-engineer-non-native-speaker-my-experience-78215.html#p588275

Director
Joined: 23 Sep 2007
Posts: 797
Followers: 5

Kudos [?]: 95 [0], given: 0

Re: DS – Problem 91 from OG11 [#permalink]  18 May 2008, 23:57
Senior Manager
Joined: 21 Apr 2008
Posts: 497
Schools: Kellogg, MIT, Michigan, Berkeley, Marshall, Mellon
Followers: 8

Kudos [?]: 29 [0], given: 13

Re: DS – Problem 91 from OG11 [#permalink]  19 May 2008, 01:31
gmatnub wrote:
http://gmatclub.com/forum/7-t62647

ups! Thanks a lot gmatnub!

Moderators: could you please delete this threat? Thanks
_________________

johnlewis1980-s-profile-feedback-is-more-than-welcome-80538.html

I'm not linked to GMAT questions anymore, so, if you need something, please PM me

I'm already focused on my application package

My experience in my second attempt
http://gmatclub.com/forum/p544312#p544312
My experience in my third attempt
630-q-47-v-28-engineer-non-native-speaker-my-experience-78215.html#p588275

Re: DS – Problem 91 from OG11   [#permalink] 19 May 2008, 01:31
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