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jamesk486: Master | Next Rank: 500 Posts; Posts: 141; Joined: Wed Mar 28, 2007 9:24 pm; Thanked: 2 times; Followed by:1 members

prep question

by jamesk486 » Mon Apr 23, 2007 12:49 am

Among a bunch of sweaters, 3/5 are pullovers and 1/4 are white. What portion of all the sweaters is not white pullovers?

(1) There are 60 sweaters in total
(2) 1/3 of the pullovers is white

Just by eyeballing I know its D, but just wondering how to solve it..

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Source: Beat The GMAT — Data Sufficiency | Mon Apr 23, 2007 12:49 am

Prasanna: Master | Next Rank: 500 Posts; Posts: 418; Joined: Mon Feb 26, 2007 6:41 pm; Thanked: 24 times

by Prasanna » Mon Apr 23, 2007 4:47 am

Is the answer D? I am getting is as B.

(2) tells us that 1/3 of the pullovers are white. Since 3/5 of the total are pullovers we can find the fraction of white pullovers and hence the non-white pullovers.

(1) tells us that there 36 pullovers and 15 whites. This does not help us calculate any additional detail.

Am I missing anything here?

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gabriel: Legendary Member; Posts: 986; Joined: Wed Dec 20, 2006 11:07 am; Location: India; Thanked: 51 times; Followed by:1 members

Re: prep question

by gabriel » Mon Apr 23, 2007 5:06 am

jamesk486 wrote:Among a bunch of sweaters, 3/5 are pullovers and 1/4 are white. What portion of all the sweaters is not white pullovers?

(1) There are 60 sweaters in total
(2) 1/3 of the pullovers is white

Just by eyeballing I know its D, but just wondering how to solve it..

hmm ... i agree with prassana .. the answer is B and not D ... just a word of caution "eyeballing" culd prove fatal in DS ... there needs to be a concrete strategy to solve DS ...