GMATPrep Question- how to answer?

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smehmood: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Sat May 10, 2008 1:48 pm

by smehmood » Mon Aug 11, 2008 11:54 am

How can I answer this question (attached)? Is there a formulae I can use?
Thanks
M

Attachments

Source: Beat The GMAT — Problem Solving | Mon Aug 11, 2008 11:54 am

Oxana: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Sun Jul 27, 2008 8:59 am; Thanked: 1 times

by Oxana » Mon Aug 11, 2008 12:34 pm

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