What is the ratio of x to y? (1) 5x = 2y (2) 2y = 7x 8 : GMAT Data Sufficiency (DS)
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# What is the ratio of x to y? (1) 5x = 2y (2) 2y = 7x 8

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What is the ratio of x to y? (1) 5x = 2y (2) 2y = 7x 8 [#permalink]

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21 Jun 2011, 17:51
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What is the ratio of x to y?

(1) 5x = 2y

(2) 2y = 7x – 8
[Reveal] Spoiler: OA

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Re: Ratio of x to y [#permalink]

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21 Jun 2011, 18:06

(1) says :
5x = 2y
=> x/y = 2/5

Sufficient

(2) says

2y = 7x – 8

But from this we can't evaluate x/y for a definite value.
So Insufficient.
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Re: Ratio of x to y [#permalink]

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21 Jun 2011, 18:45
subhashghosh - the question doesn't say that x and y are not non zero.
They could be zero!!!

What happens then?
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Re: Ratio of x to y [#permalink]

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21 Jun 2011, 18:56
0/0 is not defined, so you can ignore what if x and y = 0 in (1). Then in (2), the equation will fail if x = y = 0, because then the equation becomes 0 = -8, which is absurd.
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Re: Ratio of x to y [#permalink]

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22 Jun 2011, 18:59
1. Sufficient

x/y = 2/5

2. Not sufficient

its not possible to find x/y with the given info.

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Re: Ratio of x to y [#permalink]

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22 Jun 2011, 22:16
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Re: Ratio of x to y [#permalink]

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22 Jun 2011, 22:31
puneetj wrote:
What is the ratio of x to y?

(1) 5x = 2y

(2) 2y = 7x – 8

Ask MGMAT about the same and let us know. Either the OA should be "C" or the condition $$y \ne 0$$ should be provided.
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Re: Ratio of x to y [#permalink]

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07 Aug 2011, 22:48
I agree with fluke . Because... if either x or y is negative... then the ratio is a negative result
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Re: Ratio of x to y [#permalink]

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07 Aug 2011, 23:40
The question here asks to find the value of x/y?,

So should'nt we concentrate on the option which provides us with the value of the above question and the 1st option does.

So the correct option must b A.
Re: Ratio of x to y   [#permalink] 07 Aug 2011, 23:40
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