Distance on the number line

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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 » Fri Mar 27, 2009 12:40 am

thanks to all.

OA is E

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Source: Beat The GMAT — Problem Solving | Fri Mar 27, 2009 12:40 am

Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member; Thanked: 32 times

Re: Distance on the number line

by Vemuri » Fri Mar 27, 2009 2:49 am

Stmt 1: distance between r & 0 is 3 times the distance between m & 0. We don't know if m is on the positive side of 0 or the negative side of 0, so we will not know what is the value of r

Stmt 2: 12 is in between m & r. We do not know if m is greater than 12 or r. Insufficient.

Together, we can determine that r is 3 times m & 12 comes in between (half the distance). The only values of m & r that satisfy this condition is m=6 & r=18.

So, C is the answer.

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Baldini: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Mon Mar 02, 2009 6:06 am; Thanked: 3 times

by Baldini » Fri Mar 27, 2009 3:16 am

please can someone explain how to calculate m=6, r=18? And what is the OA?

GMAX

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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 » Fri Mar 27, 2009 6:27 am

I'm sorry I've posted this in the wrong forum!!
Anyway Vemuri, I thought it was C as well, but OA is E!

Any help?

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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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 8:43 am

Mjjking

A gives

r........0...m or 0...m........r ( This is symmetric about negative axis)
3p p p 2p

No numbers given so insuff

B gives

0...m......12.....r
k k insuff

Combining both 2p=2k ... insuff

Ans E

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