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Gmat prep ques

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Source: — Data Sufficiency |
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by Azntycoon » Sat Oct 04, 2008 10:36 am
From the statement: if w + x < 0, then w < -x or -w > x. We can infer that one is a +ve number and one is a -ve number, but we don't know which is which.

We're asked if w - y > 0. Put another way, is w > y?

Stem 1: Not sufficient. We still don't know whether W is +ve or -ve.

x + y < 0 means that x < -y.

Stem 2: Sufficient. "y < x < w" tells us that W is positive, so X must be negative (as we inferred from the main statement above). It also follows that W is > Y.
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Gmat prep ques

by Tarnbir » Sat Oct 04, 2008 9:47 pm
Thanks, seems easy once you explain it!! :o
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by raju232007 » Sat Oct 04, 2008 10:30 pm
i still have a small doubt..

w+x<0....1 (given)
y+x<0...2 (from statement 1)

1-2 gives w-y<0
therefore w<y

therefore statement 1 is sufficient,,,,,let me know whats wrong here
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by raju232007 » Sun Oct 05, 2008 2:11 am
M still awaiting for a response...Can someone help me clear my doubt?
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by Morgoth » Sun Oct 05, 2008 2:15 am
raju232007 wrote:i still have a small doubt..

w+x<0....1 (given)
y+x<0...2 (from statement 1)

1-2 gives w-y<0
Firstly 1-2 cannot give you w-y<0

you can never subtract the two inequalities, you can only add!

therefore, you cannot subtract w+x <0 and y+x<0.

Hope this helps.
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by raju232007 » Sun Oct 05, 2008 2:35 am
Thnx..i really appreciate your help..what source do you refer to for inequalities and number properties?
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by stop@800 » Mon Oct 06, 2008 10:15 pm
Azntycoon wrote:From the statement: if w + x < 0, then w < -x or -w > x. We can infer that one is a +ve number and one is a -ve number, but we don't know which is which.
Both can be negative also.

We're asked if w - y > 0. Put another way, is w > y?

Stem 1: Not sufficient. We still don't know whether W is +ve or -ve.

x + y < 0 means that x < -y.

Stem 2: Sufficient. "y < x < w" tells us that W is positive, so X must be negative (as we inferred from the main statement above). It also follows that W is > Y.
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Re: Gmat prep ques

by vivek.kapoor83 » Tue Oct 07, 2008 12:08 am
Tarnbir wrote:Please see problem below the answer is B, can someone explain?

w+x<0 is w-y>0?
a) x+y<0
b) y< x< w

Thanks!
I solved it by taking diff eg and @800 is rite..coz numbers can be -ve also.

let w = -10, x =-20(acc to b)
y = -30 . So, w-y >0 ...true

if w= 10 , x = -15 , y = -20(Consdring that w+x has to be -ve so if w is +ve , x has to be bigger no than w and with -ve sign and acc to b, y should be less than x , so taking y bigger no,)
w-y > 0 ...true.

if w = -10 and x = 5,w+x<0 holds but b fails so, w > x

Thas y....Ans is B
hope it helps....
wt do u say @800..
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by stop@800 » Tue Oct 07, 2008 12:21 am
we are given w+x is -ve and
we need to prove w>y

A
x+y is -ve
w+x is -ve
we can not derive any relation between x and y

B
it clearly states y<w
[no need to consider -ve / +ve]

so the Ans is B
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