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weird DS Gmatprep

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Newbie | Next Rank: 10 Posts
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by cochrane » Tue Feb 10, 2009 4:19 pm
I don't get why stmt 2 answers the question .....please help

OA D
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Source: — Data Sufficiency |
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by sjd00d » Tue Feb 10, 2009 7:17 pm
D is correct. As per why B is sufficient, we are given that 2x+3y<0, from B, get the the value of y in terms of x and replace y from the equation in the question stem and u'll get x<-15
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Re: weird DS Gmatprep

by x2suresh » Tue Feb 10, 2009 8:41 pm
cochrane wrote:I don't get why stmt 2 answers the question .....please help

OA D
-2x>3y --> 2x+3y<0

st 1:
clearly sufficient.
st 2:

2x+5y-20=0
2x+3y=20-2y <0
--> y>10 +ve so X must be negative

sufficient
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Re: weird DS Gmatprep

by cjb » Wed Feb 11, 2009 1:51 am
x2suresh wrote: st 2:

2x+5y-20=0
2x+3y=20-2y <0
--> y>10 +ve so X must be negative

sufficient
Ah! That's how it's done. I wish I had the same utility with inequalities that I do with equations. I'm never sure how to start manipulating them to get an answer. Tough DS inequalities are where I expect to lose most of my Q points...
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