Is m+z > 0 ?
1. m-3z>0
2. 4z-m>0
Please explain how you came to the conclusion.
gmat prep question
This topic has expert replies
-
- Legendary Member
- Posts: 2467
- Joined: Thu Aug 28, 2008 6:14 pm
- Thanked: 331 times
- Followed by:11 members
https://www.beatthegmat.com/gmatprep-m-z-0-t25999.html
Another approach when statements are combined would be
m> 3z
4z>m
therefore 4z>3z which implies z>0(z is positive)
Since m>3z m must also be positive
m+z > 0 -> YES
Choose C
Another approach when statements are combined would be
m> 3z
4z>m
therefore 4z>3z which implies z>0(z is positive)
Since m>3z m must also be positive
m+z > 0 -> YES
Choose C
-
- Master | Next Rank: 500 Posts
- Posts: 145
- Joined: Mon Feb 16, 2009 8:41 am
- Thanked: 2 times
- Followed by:2 members
I used the following reasoning and got to a diff answer.
a. m-3z>0
b. 4z-m>0
combining both
m>3z
and 4z>m
thus 3z<m<4z.
Thus m can be any value between 3z and 4z. Lets assume 3.5z.
So, m+z = 3.5 z + z = 4.5 z
Now, as we dont know anything about z, whether it is positive, negative or zero, we can't answer the question.
So, E.
Please point out any flaw in my reasoning.
a. m-3z>0
b. 4z-m>0
combining both
m>3z
and 4z>m
thus 3z<m<4z.
Thus m can be any value between 3z and 4z. Lets assume 3.5z.
So, m+z = 3.5 z + z = 4.5 z
Now, as we dont know anything about z, whether it is positive, negative or zero, we can't answer the question.
So, E.
Please point out any flaw in my reasoning.
Asset