Pls help... Inequality problem

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Pls help... Inequality problem

by gvosough » Sun Feb 27, 2011 4:22 pm
is 1/m < 1/n ?

1) m-n=3
2) 3n=m+2


Thx!

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by GMATGuruNY » Sun Feb 27, 2011 4:47 pm
gvosough wrote:is 1/m < 1/n ?

1) m-n=3
2) 3n=m+2


Thx!
Statement 1, rephrased: m = n+3
Plug in n=2, m=5. Is 1/5 < 1/2? Yes.
Plug in n=-1, m=2. Is 1/2 < 1/(-1)? No.
Insufficient.

Statement 2, rephrased: m = 3n-2
Plug in n=2, m=4. Is 1/4 < 1/2? Yes.
Plug in n=-1, m=-5. Is 1/(-5) < 1(-1)? No.
Insufficient.

Statements 1 and 2 combined:
Since we're given 2 variables and 2 different linear equations, we can solve for each variable.
Sufficient.

The correct answer is C.
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