Interesting GMATFix Problem-6

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arora007: Community Manager; Posts: 1048; Joined: Mon Aug 17, 2009 3:26 amFollowed by: 27 members; Location: India; Thanked: 51 times; GMAT Score:670

by arora007 » Tue Sep 21, 2010 12:49 pm

A=35^x * 45^k * 80^2x. What is n?
1) k=1
2) root(k) = root((2+3k-n)/3)

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Source: Beat The GMAT — Data Sufficiency | Tue Sep 21, 2010 12:49 pm

kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

by kvcpk » Wed Sep 22, 2010 6:22 am

arora007 wrote:A=35^x * 45^k * 80^2x. What is n?
1) k=1
2) root(k) = root((2+3k-n)/3)

What is n???

Interesting I dont see n in the qn.

A=35^x * 45^k * 80^2x

1) k=1
A = 35^x * 45 * 80^2x
INSUFF

2) root(k) = root((2+3k-n)/3)
3k = 2+3k-n
n=2
SUFF

pick B.

I think the qn is missing something. Can you have a look at it Arora?

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arora007: Community Manager; Posts: 1048; Joined: Mon Aug 17, 2009 3:26 amFollowed by: 27 members; Location: India; Thanked: 51 times; GMAT Score:670

by arora007 » Wed Sep 22, 2010 10:18 am

No the question is as it is...

yes..it was very strange... so strange that it took me by awe...

I squared root k and added a +/- sign on the RHS and rest is history.....should have kept my nerves on such questions...

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kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

by kvcpk » Wed Sep 22, 2010 10:20 am

arora007 wrote:No the question is as it is...

yes..it was very strange... so strange that it took me by awe...

I squared root k and added a +/- sign on the RHS and rest is history.....should have kept my nerves on such questions...

is the OA B?

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arora007: Community Manager; Posts: 1048; Joined: Mon Aug 17, 2009 3:26 amFollowed by: 27 members; Location: India; Thanked: 51 times; GMAT Score:670

by arora007 » Wed Sep 22, 2010 10:23 am

OA indeed is B.

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kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pmFollowed by: 7 members; Thanked: 215 times

by kvcpk » Wed Sep 22, 2010 10:27 am

arora007 wrote: I squared root k and added a +/- sign on the RHS and rest is history.....should have kept my nerves on such questions...

I was tempted to do this. But I plugged in the value of n back into stmt 2 and found that it results in no ambiguty.
root(k) = root(k).

So chose B.

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