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Is (m + z) > 0?

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Harish Dorai
 Post subject: Is (m + z) > 0?
 Post Posted: Fri Aug 10, 2007 3:40 pm 
Is (m + z) > 0?

1) m - 3z > 0

2) 4z - m > 0
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Guest
 Post subject:
 Post Posted: Fri Aug 10, 2007 3:51 pm 
Posted: Fri Aug 10, 2007 2:40 pm


Is (m + z) > 0?

1) m - 3z > 0

2) 4z - m > 0

1 tells m > 3z , not suffecient
2 tells z > m/4 not sufficient.

Add both the ineq's (Add is fine). Gives z > 0
since m > 3z, z>0 so m>0

Hence m+z > 0

Answer is C.
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anadi
 Post subject: Forgot to mention
 Post Posted: Fri Aug 10, 2007 4:14 pm 
that you can add the inequalities if they have same sign, either both > or both <.
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Harish Dorai
 Post subject:
 Post Posted: Sat Aug 11, 2007 10:01 am 
wonderful explanation. (C) is the correct answer.
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ali_sha12j
 Post subject: Re:
 Post Posted: Thu Aug 11, 2011 5:06 pm 
Offline
Students


Posts: 7
Guest wrote:
Posted: Fri Aug 10, 2007 2:40 pm


Is (m + z) > 0?

1) m - 3z > 0

2) 4z - m > 0

1 tells m > 3z , not suffecient
2 tells z > m/4 not sufficient.

Add both the ineq's (Add is fine). Gives z > 0
since m > 3z, z>0 so m>0

Hence m+z > 0

Answer is C.

how come adding the two inequalites gave z>0. i have a hard time understanding inequalites and their operations
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RonPurewal
 Post subject: Re: Re:
 Post Posted: Fri Aug 12, 2011 3:47 am 
Offline
ManhattanGMAT Staff


Posts: 7146
ali_sha12j wrote:
how come adding the two inequalites gave z>0. i have a hard time understanding inequalites and their operations


if you have 2 inequalities that face the same way (i.e., either both ">" or both "<"), then you can
* add the left sides
* add the right sides
* keep the same "<" or ">"

if you don't understand these sorts of things about how inequalities work, then you should check out the inequalities section in our Equations/Inequalities/VIC strategy guide.
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suchit.pandey
 Post subject: Re: Is (m + z) > 0?
 Post Posted: Sun Jan 15, 2012 1:54 am 
Offline
Forum Guests


Posts: 1
wrong post..srry
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tim
 Post subject: Re: Is (m + z) > 0?
 Post Posted: Sun Jan 15, 2012 4:22 pm 
Offline
ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
okay..

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Tim Sanders
Manhattan GMAT Instructor
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