number line

[pepeprepa]

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

[LSB]

E

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

[sethids]

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.

[pepeprepa]

You are both right, answer is E.