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ladhanivishal
- Junior | Next Rank: 30 Posts
- Posts: 15
- Joined: Mon Nov 17, 2008 3:27 am
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DS question.. x=3y
Source: Beat The GMAT — Data Sufficiency |
r u sure the question u have typed is correct?ladhanivishal wrote:is it really a silly question? does anybody have anything to offer??
x=3y means:
1. Both x and y have the same sign => both positive or both negative
or
2. Both are zero
Now the question asked is - Is X^2> y^2? so all we need to know is whether they fall into category 1 or 2. If they fall into category 1. then the answer is Yes and if they fall into category 2 then the answer is No.
1) This says that x+y < x*y
This means that the x and y cannot be a fraction or negative integer or zero.. Which is sufficient to answer the question.
2) x^2 = 9 * y^2
Here x and y can be zero and can satify the equation. In this case the answer to the question would be NO.
But x and y can also be positive integers where x^2 / y^2 = 9 in which case the answer to the main question would be YES. Hence Insufficient!!
So answer is A.
1. Both x and y have the same sign => both positive or both negative
or
2. Both are zero
Now the question asked is - Is X^2> y^2? so all we need to know is whether they fall into category 1 or 2. If they fall into category 1. then the answer is Yes and if they fall into category 2 then the answer is No.
1) This says that x+y < x*y
This means that the x and y cannot be a fraction or negative integer or zero.. Which is sufficient to answer the question.
2) x^2 = 9 * y^2
Here x and y can be zero and can satify the equation. In this case the answer to the question would be NO.
But x and y can also be positive integers where x^2 / y^2 = 9 in which case the answer to the main question would be YES. Hence Insufficient!!
So answer is A.
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