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ds - easy inequality or so i thought

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Senior Manager
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ds - easy inequality or so i thought [#permalink] New post 14 Dec 2006, 22:34
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A
B
C
D
E

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Is x > y?

1. x/(3y) > 1/3
2 -x + p < -y + p
Director
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 [#permalink] New post 15 Dec 2006, 00:21
Isn't it D? :)
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 [#permalink] New post 15 Dec 2006, 00:47
Nuu. It's B

Be extra careful with inequality of unknown.
Because if these unknowns are negative, you gotta flip the direction of '>' accordingly. But if they are positive, you don't have to.

Always consider the possibility of the unknown being positive AND negative.

x/y > 1
could be
1)-10/-1 > 1 OR
2) 10/1 > 1

So, we are not sure which is the case
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livin in a prison island...

Director
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 [#permalink] New post 15 Dec 2006, 07:54
Thanks! I got it wrong too, I will know to look out for this going forward.

Viperace wrote:
Nuu. It's B

Be extra careful with inequality of unknown.
Because if these unknowns are negative, you gotta flip the direction of '>' accordingly. But if they are positive, you don't have to.

Always consider the possibility of the unknown being positive AND negative.

x/y > 1
could be
1)-10/-1 > 1 OR
2) 10/1 > 1

So, we are not sure which is the case
SVP
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 [#permalink] New post 15 Dec 2006, 11:14
Is x > y?

1. x/(3y) > 1/3
2 -x + p < -y + p

x/3y>1/3 ie : 3y/x<3 thus either y/x is +ve or -ve fraction and x>y or both x, y -ve and x< or >y....insuff

from two
-x<-y thus x>y sufff

my answer is B
  [#permalink] 15 Dec 2006, 11:14
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