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by sanju09 » Fri May 21, 2010 4:28 am
Please read it for me...
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Source: — Data Sufficiency |
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by liferocks » Fri May 21, 2010 4:32 am
Is m+z>0

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

discussed here https://www.beatthegmat.com/greater-than ... tml#254470
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by Patrick_GMATFix » Fri May 21, 2010 10:18 am
To be fair, this is a tough question, but it should teach you an important take-away: In general it's better to rephrase your equations so that you do not have leading negative signs in front of your variables. In this case, rewrite the statements as:
(1) m > 3z
(2) 4z > m.

Alone these give no information about signs. However when we put them together, we learn that 4z > 3z --> z > 0 and that will make all the difference (since m > 3z, m will also be > 0). The correct answer is C

This is QID 1020

-Patrick
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