Proportion : GMAT Problem Solving (PS)
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# Proportion

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Director
Joined: 28 Jul 2011
Posts: 563
Location: United States
GPA: 3.86
WE: Accounting (Commercial Banking)
Followers: 3

Kudos [?]: 218 [0], given: 16

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10 Jan 2012, 06:22
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Question Stats:

50% (00:00) correct 50% (00:00) wrong based on 2 sessions

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Can anyone help with this???
[Reveal] Spoiler: OA

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Intern
Joined: 16 Dec 2011
Posts: 49
GMAT Date: 04-23-2012
Followers: 0

Kudos [?]: 6 [0], given: 12

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10 Jan 2012, 06:35
a:b:C = 3:4:7
a/b =3/4
b/c =4/7
implies a = 3/4b
& c= 7/4b

substiute in c-a = 12 we will get value of b and accordinlgy all values and add them

so both are rquired to answer it ......... it should be C both stats together are suiffcient
could u tell me what is the correct answer
Director
Joined: 28 Jul 2011
Posts: 563
Location: United States
GPA: 3.86
WE: Accounting (Commercial Banking)
Followers: 3

Kudos [?]: 218 [0], given: 16

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11 Jan 2012, 02:28
pbull78 wrote:
a:b:C = 3:4:7
a/b =3/4
b/c =4/7
implies a = 3/4b
& c= 7/4b

substiute in c-a = 12 we will get value of b and accordinlgy all values and add them

so both are rquired to answer it ......... it should be C both stats together are suiffcient
could u tell me what is the correct answer

But when we add all together we get a final value of 2C.....which can vary based on the value of C right.....how can C be the answer
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Intern
Joined: 16 Dec 2011
Posts: 49
GMAT Date: 04-23-2012
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Kudos [?]: 6 [0], given: 12

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11 Jan 2012, 02:40
when we solve this we will get a= 9 b= 12 and c = 21

now a+b+c = 9+12+21 = 42 so these values are satisfyin both options 9:12:21= 3:4:7 and c-a =21-9=12
so where is the confusion .. as both are required to answer it
i hope u understood this
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11 Jan 2012, 02:48
It also gives you the difference between two ratios thereby defining the ratio and hence C is the correct answer !
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Re: Proportion   [#permalink] 11 Jan 2012, 02:48
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