Bunuel wrote:
If x - y > 10, is x - y > x + y ?
Given: \(x-y>10\).
Question: is \(x-y>x+y\)?
Is \(2y<0\)?
Is \(y<0\)?
(1) \(x=8\). Plug into \(x - y > 10\):
\(8-y>10\);
\(y<-2\), hence \(y<0\). Sufficient.
(2) \(y=-20\), hence \(y<0\). Sufficient.
Answer: D.
perfect , no doubt !
but can u pl help me with the following approach? it happened to strike in exam..
lets say i rephrase the question to 'Is X+Y<10 ? ' since i know X-Y>10 .
Now (i) sufficient
but (ii) is not. For example - when I substitute y=-20 in x-y >10 , I get X>-10. and then I use this range in X+Y<10.. i get both Y and N.
need urgent help in this. Thanks
Bunuel