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set 19 Q. 13

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by Rashmi1804 » Fri Apr 03, 2009 7:26 am
DS

If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x < -14y

Could anyone explain how is A sufficient ??

OA: D

I guess the OA is wrong!!
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Source: — Data Sufficiency |

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Re: set 19 Q. 13

by Brent@GMATPrepNow » Fri Apr 03, 2009 9:08 am
Rashmi1804 wrote:DS
If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x < -14y
Could anyone explain how is A sufficient ??
OA: D
I guess the OA is wrong!!
I don't believe (1) is sufficient
Case a) y=1 and x=6: we get 3(6) > 7(1)
Case b) y=100 and x=105: we get 3(105) < 7(100)
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by mike22629 » Fri Apr 03, 2009 9:10 am
I believe you are correct. if you fill in possible values of x and y with the first constraint you can find 3x greater than or less than 7y. When adding or subtracting a value in a ratio, the relationship does not stay constant.

I believe it is B.
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