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INEQUALITY

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Source: — Data Sufficiency |
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by maihuna » Wed Jan 07, 2009 10:32 am
If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x < -14y

One is saying x-y >4 so nothing can really be concluded. See below:

x = 6 , y = 1 x-y = 5 3x = 18, 7y = 7 so 3x>7y
x = 20, y = 15, x-y = 5>4, 3x = 60, 7y = 105 so ex<7y

2. 5x>14y
if 3x>7y => 6x>14y since we know 5x>14y we can say 6x>14y so 2 solve it

Ans: B
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by cramya » Wed Jan 07, 2009 5:34 pm
The OA will say D) but the correct answer is B)

Good job Maihuna!
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Re: INEQUALITY

by logitech » Wed Jan 07, 2009 8:35 pm
If x and y are positive, is 3x > 7y?

Is 3x-7y>0 ?


(1) x > y + 4


x-y>4

3x-3y>12

we dont know Y so if 4y is bigger than 12 it will be less than 0

INSUF



(2) -5x < -14y[/quote]

5x-14y > 0

2.5x -7y>0

Well if 2.5 X - 7y is bigger and X is POSITIVE

3x is definetly bigger than 2.5 X

SUF

So choose B
LGTCH
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