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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Tue Mar 24, 2009 11:55 pm

Answer is C

thanks folks!

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Source: Beat The GMAT — Problem Solving | Tue Mar 24, 2009 11:55 pm

NethraN: Senior | Next Rank: 100 Posts; Posts: 35; Joined: Mon Apr 14, 2008 12:40 am; Thanked: 1 times

by NethraN » Wed Mar 25, 2009 1:55 am

I go with C.

Nethra

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mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Wed Mar 25, 2009 3:50 am

I go with C too, but why?

Beat The GMAT - 1st priority
Enter a top MBA program - 2nd priority
Loving my wife: MOST IMPORTANT OF ALL!

REAL THING 1 (AUG 2007): 680 (Q43, V40)
REAL THING 2 (APR 2009): 720 (Q47, V41)

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NethraN: Senior | Next Rank: 100 Posts; Posts: 35; Joined: Mon Apr 14, 2008 12:40 am; Thanked: 1 times

by NethraN » Wed Mar 25, 2009 4:32 am

Because with stmt 1 alone is not sufficient and stmt 2 alone would be sufficient if it is mentioned that 'S' is positive but since this is not stated explicitly 'S' and be -ve and if its -ve 0 wont lie between r and s.

Now since stmt 1 says 'S' is positive we can derive the result from stmt 2.

So, both stmts together are sufficient.

Correct me if I am wrong.

Nethra

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rs2010: Master | Next Rank: 500 Posts; Posts: 232; Joined: Fri Jul 04, 2008 4:14 pmFollowed by: 1 member; Thanked: 14 times; GMAT Score:760

by rs2010 » Fri Mar 27, 2009 9:26 am

Yes combining both will information that

-s and r are same point on the number line so C.

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vittalgmat: Legendary Member; Posts: 621; Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members; Thanked: 33 times

by vittalgmat » Fri Mar 27, 2009 9:04 pm

C
Here is my approach

The problem can be rewritten as

Is s = -r ?

Stmt 1 is not sufficient.

Stmt 2 can be written as t -r = t - (-s) OR r -t = t -(-s)
simplifying s = -r. OR r -t = t + s.

Using both stmts, we get s = -r. So C

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