how to solve these questions GMAT prep

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nervesofsteel: Legendary Member; Posts: 594; Joined: Thu Aug 14, 2008 11:51 pm; Thanked: 12 times

by nervesofsteel » Tue Aug 25, 2009 12:37 am

can some one provide an easy method of solving
these questions

is m+z > 1

1) m-3z > 0
2) 4z-m > 0

OA after discussion..

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Source: Beat The GMAT — Data Sufficiency | Tue Aug 25, 2009 12:37 am

mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

Re: how to solve these questions GMAT prep

by mehravikas » Tue Aug 25, 2009 1:03 am

you can add both the inequalities that will give Z > 0

m-3z > 0
-m + 4z > 0

therefore you know z > 0, now equation 1 says m > 3z
Now you that both m and z are greater than zero. pick some numbers you you will get the answer m + z > 0

Doubt: Can you check the question, I think it is m + z > 0

nervesofsteel wrote:can some one provide an easy method of solving
these questions

is m+z > 1

1) m-3z > 0
2) 4z-m > 0

OA after discussion..

Like this post

kbharadwaj.1987: Senior | Next Rank: 100 Posts; Posts: 85; Joined: Fri Jul 24, 2009 4:05 pm

by kbharadwaj.1987 » Tue Aug 25, 2009 5:26 am

Or it could be this way:
Stmnt 1:
m-3z>0
=> m+4z-3z>4z
=> m+z>4z
Stmnt 1 is insuff cuz z could also be 0.1 or 10, anything
Stmnt 2:
4z-m>0
=> 4z-5z-m>-5z
=> -m-z>-5z
=> m+z<5z
Insufficient as again z could be anything.
E

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

Re: how to solve these questions GMAT prep

by mehravikas » Tue Aug 25, 2009 11:49 am

If the question is m + z > 1 answer would be E, if the question is m + z > 0 answer would be C

nervesofsteel wrote:can some one provide an easy method of solving
these questions

is m+z > 1

1) m-3z > 0
2) 4z-m > 0

OA after discussion..

Like this post

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