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Is X + Y Negative? i) X is Positive. ii) Y is Negative. It's [#permalink]
 15 May 2011, 06:42
Question Stats:
45% (01:13) correct
54% (00:12) wrong based on 11 sessions
Is X + Y Negative?
i) X is Positive.
ii) Y is Negative.
It's just a easy question, and I got wrong. (My Bad!)
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Re: Algebra - Data Sufficiency. [#permalink]
15 May 2011, 06:52
hitmoss wrote: Is X + Y Negative?
i) X is Positive.
ii) Y is Negative.
It's just a easy question, and I got wrong. (My Bad!) 1) and 2) clearly insufficient. 1)+2) still ins. Consider, x=10, y=-3, -> x+y=7>0x=10, y=-35, -> x+y=-25<02 different answers. (E)
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Re: Algebra - Data Sufficiency. [#permalink]
18 May 2011, 11:54
And is E .... Is this level 500 Q?
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Re: Algebra - Data Sufficiency. [#permalink]
18 May 2011, 21:57
no relative information between X and Y. E
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Re: Algebra - Data Sufficiency. [#permalink]
19 May 2011, 05:24
X = 1, Y = +2 X = 2 Y = -1 Answer - E
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Re: Algebra - Data Sufficiency. [#permalink]
19 May 2011, 13:06
x+y<0 if both x & Y are - or x is - and y is + with |x|>|y| or x is + and y is - with |y| > |x|.
Even with the combinaion, since we only know the sign not the magnitude, it is insuff.
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Re: Algebra - Data Sufficiency. [#permalink]
19 May 2011, 15:47
1. Not sufficient
x>0
if y>0 then x+y is not less than 0
if y<0 x+y may or may not be less than 0
2. Not sufficient
y<0
if x<0 then x+y<0
if x>0 x+y may or may not be less than 0
together
x>0 y<0
x y
1 -1 => x+y is not less than 0
1 -2 =>x+y <0
Hence not sufficient.
Answer is E.
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Re: Algebra - Data Sufficiency.
[#permalink]
19 May 2011, 15:47
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