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confirm pls?

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by magical cook » Thu Nov 22, 2007 9:56 am
If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x < -14y



I think the answer is B but OA is D -- can anyone confirm?
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Source: — Data Sufficiency |
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Re: confirm pls?

by gabriel » Thu Nov 22, 2007 6:24 pm
magical cook wrote:If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x <14y> a, then 3/7 has to be greater than a ..

So if 1*x is > a then 3/7*x has to be greater than a ..

the first choice says x>y .. so as explained 3/7*x has to be > y .. hence the answer D ..
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by ri2007 » Thu Nov 22, 2007 7:21 pm
Gabriel,

Could you pls explain that again?

Thanks in advance
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by sujaysolanki » Thu Nov 22, 2007 9:02 pm
From stem we need to find is x > 7/3y

From stmt 1 X > y + 4

Pick some numbers to verify ..say
x y = 6,1 or x y = 5 , -2 Conditions holds true Hence knock of BCE left with AD


From stmt 2 is given that x > 14/5y hence it has to > 7/3y

Hence Both are sufficient Hence D
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by gabriel » Fri Nov 23, 2007 12:09 am
ri2007 wrote:Gabriel,

Could you pls explain that again?

Thanks in advance
Hey Ri2007

The whole explanation has not showed up due to some posting problem, anyway forget the post the logic I used was not right.
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by gabriel » Fri Nov 23, 2007 7:30 am
There does not seem to be a algebraic solution over here, smart substitution is the way forward... while subbing make sure you are covering all possibilities ...

Regards
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by sujaysolanki » Fri Nov 23, 2007 9:40 pm
My mistake looks like it should be B ...From stmt 1 we dont get a unique answer ..

Btw whats the source of this question
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