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Is x> y ???

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Source: — Data Sufficiency |
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by kishore99 » Sun Jul 12, 2009 5:30 pm
IMO D.

x/3y > 1/3

multiplying both sides with 3y gives x>y.
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by shibal » Sun Jul 12, 2009 6:32 pm
i got D as well...
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by yogami » Sun Jul 12, 2009 8:25 pm
Answer is B.
This is because (1)states x/3y > 1/3
This implies that x/y > 1
However this does not mean that x > y. Because both x and y can be negative.
eg: -8/-2 = 4 which is greater than 1 and yet x < y
And 8/2 = 4 > 1 and x > y
so (1) is insufficient
(2) is sufficient for obvious reasons
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Re: Is x> y ???

by vittalgmat » Sun Jul 12, 2009 9:27 pm
score wrote:Ques Is x > y

A is x/3y > 1/3
B is -x+p > -y+p

Can anyone help on this - I picked D.

Ans is B
Yep the answer is B for the following reasons

Consider A:
x/3y > 1/3
Transforming: x/y > 3/3 => 1
so the ratio of x to y > 1
Choose +ve and -ve values for x and y.
1. x = 3, y = 1
x/y >1 and x > y
2. x = -3, y = -1
x/y > 1 and x < y
So Insufficient.

Consider B:
-x + p > -y + p
Here we are adding the same p to both sides so it does not affect the inequality, assuming p is a constant.

so it is the same as -x > -y
ie x < y

So sufficient.

Ans is B
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