If x and y are positive, is 3x > 7y?
(1) x > y + 4
(2) -5x < -14y
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
INEQUALITY
This topic has expert replies
-
anjaligeorge1
- Senior | Next Rank: 100 Posts
- Posts: 66
- Joined: Wed Feb 20, 2008 6:23 pm
- Thanked: 2 times
-
maihuna
- Legendary Member
- Posts: 1578
- Joined: Sun Dec 28, 2008 1:49 am
- Thanked: 82 times
- Followed by:9 members
- GMAT Score:720
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
(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
-
logitech
- Legendary Member
- Posts: 2134
- Joined: Mon Oct 20, 2008 11:26 pm
- Thanked: 237 times
- Followed by:25 members
- GMAT Score:730
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
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
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
