number line

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pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Sat Aug 23, 2008 3:03 pm

If m and r are two numbers on a number line, what is the value of r ?
1) The distance between r and 0 is 3 times the distance between m and 0
2) 12 is halfway between m and r

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Source: Beat The GMAT — Data Sufficiency | Sat Aug 23, 2008 3:03 pm

LSB: Master | Next Rank: 500 Posts; Posts: 229; Joined: Thu Nov 08, 2007 3:47 pm; Thanked: 14 times; GMAT Score:750

by LSB » Sat Aug 23, 2008 3:11 pm

E

r=6 --> M=18
r=-12 --> M=36

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sethids: Master | Next Rank: 500 Posts; Posts: 135; Joined: Mon Jun 23, 2008 3:56 am; Thanked: 7 times

IMO E

by sethids » Sat Aug 23, 2008 3:25 pm

E should be the answer

Stmt1: 0-r = 3(0-m)
r and m could be on either side of zero. Insufficient. Left with B, C, or E.
Stmt2: m-12 = 12-r
=> m+r = 24. Insufficient. Left with C or E.

Combining the 2 stmts we could have both negative and positive values of r. Hence E.

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pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Sun Aug 24, 2008 12:50 am

You are both right, answer is E.

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